I'm trying to learn python, but instructions aren't helping. Would someone drop a code for a simple platformer? I usually do better by tweaking and seeing what changed rather than trying from scratch

If you're using Godot (whose GDScript is similar in syntax to Python), you can find several tutorial videos for platformers that provide the code step by step, with some even making the full code available in a github repository.

I'll look; can godot work on Kindle too? Or I'd need a pc?

You'd need a PC to run the Godot editor. I'm not aware of many game editors that run on the Kindle/Fire since I haven't used it.

But you don't need to be limited to using Godot - I think tutorials would be available for other Python game frameworks as well, such as Pygame. So whatever you're using right now, see if there's any tutorials for that on Youtube or other sites, as they may also make code available.