It's really hard to notice capture sequences, you can capture in absurd ways, what not?
It's impossible for me to play this game. Even chess is easier. How do I improve (I'm only trying to improve past the beginner level, as I mainly play chess as a board game (unrelated to checkers), but literally anybody I play beats me with ease in checkers, and I don't want that)?

As ä beginner myself, I can recommend the following study series:

lidraughts.org/study/0X2SC8Qa

It teaches the rules, followed by progressively more difficult concepts. But the thing is that this series is built in such a way that it builds on itself.

I had the exact same feeling as you (comparison with chess included). The (pre)Course in Draughts by Tjalling Goedemoed (link in the previous post) is the best resource I could find.

Also try Frisian draughts if you want your brain to melt down.

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Who told you it was a simple game? You were cheated - it's a difficult game ) To develop, you need to study the literature on the game, solve a lot of problems, and maybe even take lessons from a coach.

I think the bigger difference is with chess there are so many videos of good players explaining how to play the game and what their thoughts are in a given position and with indepth tutorials. On this it seems more I am trying to learn it on my own with a few written resources.