I have recommended electronics, gear, tools and materials shared along with showing where to purchase these upon. I search for the best rates along with.
The links are copy and paste in order to keep within SEO/Search engine requirements.
HRCF = “Happy RC Flyer” for short.

Transmitters – Radio – Receiver
Flysky FS-i6 RC Transmitter and Receiver FS-iA6 6CH. This is a robust, fully capable, multi plane programmable quality transmitter that is very affordable.

https://link.amazon/B0hLgQ56Z
Flysky FS-i4 4CH RC Transmitter with Receiver FS-A6, 2.4GHz 4 Channel AFHDS 2A Remote Controller. This is also quality as it’s counterpart, just more old school on the controls and settings.

https://link.amazon/B0iqbxBvU
Flysky FS-iA6B Receiver 2.4G 6CH for Flysky FS-i6X/i4/i6/i10 RC Transmitter
* compatable with both Fly-Sky transmitters.

https://link.amazon/B0fTz1Ksr
2PCS Flysky FS-BS6 Receiver, 2.4G 6CH Receiver 2.4G AFHDS 2A with Gyro. For Gyro based flight training to a range of vtol aircraft, this is a quality addition to include.

https://link.amazon/B0hpOTZnM
Spektrum DX6e 6-Channel DSMX 2.4GHz RC Radio Transmitter Only (No Receiver) with 250 Model Memory | Telemetry | Wireless Trainer Link, SPMR6655. For the more expensive side of things in this area.

https://link.amazon/B08Y5ycuJ
6 Channels 2.4GHz S603 Aircraft Receiver for JR/Spektrum DSM-X DSM2 Remote Control Ultra Long Range 6CH 3.5-9.6V Receiver

https://link.amazon/B02MFs8Mm
Standard Park Flyer gear
RC Airplane Motor, 2212 KV2200 Brushless Motor 40A XT60T SG90 Servo 6035 Propeller Accessory Kit for RC Aircraft RC Plane. Anything close to the can/kv/esc/etc. recommended here is usable for the Park Flyer lines.

https://link.amazon/B026EFmMd
Replacement shafts for the motor should you bend them in a crash. 10PCS RC Motor Shaft 3.17mmx40mm, High Torque RC Motor Shaft Tough Steel Motor Shafts Replacement for 2628 2830 2212 Brushless Motor

https://link.amazon/B0jc4q4f0
10pcs Rc Propeller for Model Electric Plane recommended for the Park Flyer scale series. Curtiss Jenny, Slow Stick Jenny, Mini Mambo and the range in that regard.

https://link.amazon/B0gwbokvT
2 Pcs 9060 9″x6″ Propeller, Gray Nylon, CCW, a more expensive range upon worth the upgrade. APC brand. These series are the best along performance and pitch, they also are going to remain solid and not bend upon impact, still, there are times you want the prop to give in order to save the rest of the airframe should you crash.

https://link.amazon/B06vEdmfe
2 Pcs 7050 7″x5″ Propeller, Gray Nylon, CCW. Twin Boom Pusher and Alt-Aero recommended prop. No worries along crash resistance since these are pushers, still, I admire their strength and quality along with amazing pitch and fine tuned shape.

https://link.amazon/B0hmAJmNO
SG90 Servo Motor Micro Servo 9G

https://link.amazon/B082mFl4u
MG90S 9G Metal Gear Servo’s

https://link.amazon/B05jUyQGD
104 Pcs Spring Steel Wire, 12 Sizes 0.3-3 mm Stainless 40 cm
The links are copy and paste in order to keep within SEO/Search engine requirements.
https://link.amazon/B031JJ5Kx
10 PCS 0.047×10.24″ Steel Pushrods And 10 PCS Nylon 0.79×0.43″ Lock on Control Horns 4 Holes for RC Airplane Model Aircraft DIY Parts

https://link.amazon/B0357ldMu
156pcs 40cm Length Straight Stainless Steel Spring Wire Assortment Kit, 13 Different Full Hard Steel Wire Diameter 0.2mm 0.3mm 0.4mm 0.5mm 0.6mm 0.8mm 1mm 1.2mm 1.4mm 1.6mm 1.8mm 2mm 3mm

https://link.amazon/B04PgwDse
20 PCS Dia 1.3mm Adjustable RC Airplane Pushrod Connector Linkage Stopper for Model Aircraft DIY Replacement Parts. These can be drilled out for wider piano wire lengths then listed. They are extremely convenient to use once properly installed and they hold the push rods in place extremely well also.

https://link.amazon/B0buXKjHQ
TATTU 3S 11.1V 1300mAh 45C LiPo Battery Pack with XT60 Plug for Eachine Wizard X220 QAV250 QAV180 210 Vortex 285 Mini H FLIP FPV 250S Emax Nighthawk 250 ZMR 250 HOVERSHIP MHQ2 Twin boom pusher, Curtiss Jenny and most Park flyer scale kits here at HRCF – “Happy RC Flyer” – compatible.

https://link.amazon/B0bjjo7Xa
Tattu 650mAh 4S1P 75C 14.8V Lipo Battery with XT30 Plug. Compatable with the HRCF 250 series planes along with the Slow Stick plane lines.

https://link.amazon/B0igPrefp
2 Pack 7.4V 1200mAh Li-ion with SM-4P Plug Rechargeable Battery. HRCF Slow Stick lines compatible.

https://link.amazon/B05hSSevF
Zeee 3S Shorty Pack Lipo Battery 2200mAh 11.1V 50C Battery with XT60 Plug for RC Car Truck Vehicles RC Boat RC Drone Airplane Quadcopter Helicopter FPV RC Hobby Models. Compatible with the HRCF Alt-Aero and Mini Mambo planes.

https://link.amazon/B0cLXJPx0
FLY RC Cellmeter 7 Digital Battery Capacity Checker Controller Tester Voltage Tester for LiPo Li-ion NiMH Nicd Battery. Always good to be able to check the status, health and charge level for your batteries with this.

https://link.amazon/B0dJSW7SZ
AUTOUTLET 20PCS 10Pairs XT30 Bullet Connectors Plugs Male & Female with Heat Shrink for RC Car/Boat/LiPo Battery Used on the 250 series batteries and can be used on all of the other lines. * I recommend light sanding on the male connectors so the fit is not overly tight on XT connectors.

https://link.amazon/B0f4RQXwL
10 Pairs XT60 Battery Connector Male & Female Bullet Connector Plug for RC LiPo Battery Motor FPV Airplane Quadcopter Standard Park Flyer scale connectors. I recommend getting both sizes so you can both revise the packs connections, you can make adapters to interchange them between scale of models.

https://link.amazon/B0eNXrViT
B3 Lipo Battery Charger – 2S 3S RC Balance Chargers AC 7.4-11.1V 10W with XH3P XH4P Plug for RC Car Batteries Drone Boat Airplane Truck Quadcopter Airsoft SCX24 SCX10. A good low end budget charger is all that’s needed for the Park Flyer and Back Yard / 250 series plane, HRCF recommended batteries.

https://link.amazon/B00CGrBE1
Flysky SM100 USB RC Helicopter Airplane Simulator for Flysky FS-i6 FS-i4 FS-TH9X FS-T6 FS-T4B FS-GT3 FS-GT2 Remote Controller. This is required if you want to practice with a simulator.

https://link.amazon/B0hj2FYfx
REALFLIGHT Trainer Edition w/ WS2000 RFL-1212. Learning on a simulator is recommended even if you have someone showing you the ropes in person how to fly rc. It teaches coordination and most importantly, visual orientation and no worry along mishaps since it’s just a sim.

https://link.amazon/B07CavPvh
250 Series – Backyard Flyer scale plane gear – review above, Park Flyer gear for additional compliment.
EMAX ECO Micro Series 1407 2~4S 2800KV Brushless Motor For FPV Racing RC Drone.
*Use their search feature at their website to find the motor used on the series I use since direct linking does not work. I supply the mounting systems for the motor to attach to the motor mount in all of my kits that use this series of motors.

Emaxmodel.com
4Pcs Mini Super Light 3.7g GH-S37D Digital Servo 3.6V-4.8V for Control Aircraft Flight Direction RC Airplane Car Boat

https://link.amazon/B0cRkB87x
Mini 20A Brushless ESC with 5V BEC XT60 & 3.5mm Plugs (2 Pcs) works with the 250 series and the micro – 80 gram series HRCF plane lines.

https://link.amazon/B0hJDFQ97
RC Propellers 6030 6×3 Inch CW CCW 2-Vane Yellow w/Adapter Rings.

https://link.amazon/B03IC3zIL
Micro gear – Mini Slow Stick Jenny 80 gram series.
2pcs FH-1083 1.7g servo Low Voltage Micro Digitale Servo Mini JR Connector RC Model (JR)

https://link.amazon/B05nzTjdV
Brushless Motor C05M 1104 3700KV 1.5mm Shaft Brushless Outrunner Motor for RC Aircraft Plane Airplane Multi-copter

https://www.aliexpress.us/item/3256804964839427.html?src=google&src=google&albch=shopping&acnt=708-803-3821&isdl=y&slnk=&plac=&mtctp=&albbt=Google_7_shopping&aff_platform=google&aff_short_key=UneMJZVf&gclsrc=aw.ds&albagn=888888&ds_e_adid=&ds_e_matchtype=&ds_e_device=c&ds_e_network=x&ds_e_product_group_id=&ds_e_product_id=en3256804964839427&ds_e_product_merchant_id=107907811&ds_e_product_country=US&ds_e_product_language=en&ds_e_product_channel=online&ds_e_product_store_id=&ds_url_v=2&albcp=19108282527&albag=&isSmbAutoCall=false&needSmbHouyi=false&gad_source=1&gad_campaignid=19108284222&gclid=Cj0KCQjwk5nVBhDiARIsAHNGqac777oduZTYIPEOOzdHNGDetB9m5D5j8a8NVvGOQZ_QlKBWavqecUwaAknmEALw_wcB&gatewayAdapt=glo2usa
400mAh 2S 7.4V 30C LiPo Battery with JST Plug.

https://link.amazon/B0iiB5gkN
Hurricane 4024 Durable 2-Blade Propeller (1.5mm Shaft – Set of 8) – 4 – Blue

https://link.amazon/B06Bgz0RZ
Additional tools and wares.
Covering iron. Digital Edge Banding Iron with LCD Screen | Extra-Long 8.2 ft Cord | Adjustable Temperature for Woodworking, Veneer & Crafts, RC Hobbies. Good for covering Doculam, Ultracoat and all other plastic heat shrink film.

https://link.amazon/B0iAycUqJ
Heat Gun,572℉& 1112℉ Dual Temperature Control Heat gun for shrinking the covering.

https://link.amazon/B0jgwcfOI
Weller 30W Soldering Iron with LED Halo Ring | WLIR3012A – My Go-to Soldering iron, it packs plenty of power and having the directed LED lights built in illuminating the work area is very helpful.

https://link.amazon/B02jbmdN9
Pin Vise Hand Drill Manual With 22pcs Micro Drill Bits Set. This is a must have in any hobbyist tool collection. I use one for the control horn mounting holes always and a range more. There are times when it’s best to have the tactile manual tool for boring holes not to mention the amazing volume of thin drill bits which are included with it.

https://link.amazon/B05moKYIW
There will be more to come along the gear, wares and extra’s.