Without more information what exactly you want to do/learn, that’s kinda hard. Racing? Acrobatics? Micros/Woops (flying in your home/garage)? Drone as a cinematic camera (DJI-style) or faster camera work (chasing motocross riders for video for example)?

Also specific recommendations for hardware heavily depend on this and just personal preference, and what else you might want to do with the radio and/or video equipment. As an introduction and overview, like someone else has already commented, check out Joshua Bardewell on youtube. He literally makes everything from introduction, basic tutorial, to advanced guides and deep dives into anything drone-related as his full time job.

All of the OpenTX/EdgeTX radios work on Linux as a controller, and generally most radios that support this probably will, because they just appear as a joystick (HID profile). There are also ways of connecting them other than just plugging the radio into usb and selecting “controller mode”, but even those usually result in a joystick device I think? So which radio in particular mostly depends on what kind of drone you want to fly, if you want to fly other things (plane, helicopter, scale models), or drive other things (cars/boats/crawling/scale models). Also ergonomics (size of hands, similar to a classic radio or similar to a game controller?) and just personal preference, mostly.

As for the Sim, I think Liftoff has a native Linux port, but these days most of the sims should just work anyway with the recent developments of valve for the steamdeck.

No matter which kind you pick, you always start with a simulator unless you have more money than sense. There are free ones, and good ones aren’t expensive either. Radios these days can just be plugged into a computer so you’re using your actual controller for the simulator, too.

Very short answer: Get any of the opentx/edgetx transmitters (like radiomaster, jumper). go for expressLRS as a protocol for transmitter/receivers (2.4g). The default firmware for flying yourself is betaflight (racing, acro, some camera drones like cinewhoops). If you want the drone to fly itself (gps missions) it’s probably ardupilot, but check legality in your area first. I have no direct recommendation for video for you, sorry.

Much simpler and more direct than the other suggestions: LocalSend.

Also fully open source, local only, cross platform. Only works in the same network, obviously. That’s the point.

Of course you can. The actual question is: do you trust the author(s) of the repositories you’re pulling the APKs from? Including that they are keeping the repo secure from malicious influences? If the answer is “no”, then you shouldn’t add the repo, obviously. Every repository acts as an individual trust anchor. Unlike F-Droid or the play store, where the store itself acts as the trust anchor (or should, at least)

To be clear, I’m using obtainium for quite a few apps, but I’m rather rather careful which I add there and what apps I’m getting elsewhere.

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Do I understand you correctly that Floris had swipe typing? Cause I tried the OpenBoard fork that has it, and it was horrible. It technically worked, sometimes, but most often was even slower than hitting individual letters. Usually I have to correct maybe 1 word out of 20 or so with GBoard, and even then what I want is one of the suggestions 95% of the time. with the OpenBoard fork, 3 out of 5 words were wrong and the correct one was suggested like 2 out of 5 times.

If its swipe is usable, I might give Floris a go…

edit: ah, English only. Not gonna work for me. I also prefer to have multiple languages active and being able to swipe in any/all of them. guess I’m stuck with GBoard…

Relay can also do this

I also don’t understand why I can’t be shown 2-3 options, it’s incredibly convenient. Manually adding waypoints, or manually telling it to avoid roads, isn’t and it’s also not the same thing. On Google I see whole alternative routes, in osmand I only see an adapted route when I make a change (waypoint/avoid), but I still only see that one route now. I no longer see the old one to compare, and switching back is cumbersome.

I don’t really understand why a few options aren’t shown as a default, maybe with slightly certain criteria if possible for a particular a to B. Like one avoiding highways, or hills, or just smaller roads. Maybe a shortest and a quickest, maybe one with fewest lights. If that’s not possible, just show some comparable options with similar travel time? Would really improve the experience a lot.