As I forget every time what works and what not, here.

OBS

A cross-platform tool for that kind of tasks. While it has lots of options, for basic stuff it's simple.

Basic steps:

On the panel at the bottom, add a source, which can be a "window", "screen", "camera", etc.
Check audio on the next rectangle. You cam mute it if you won't want any sound by clicking the audio icon.
Click Settings on the far right rectangle of the panel, and configure "Output" for location/format of the output file.
Click Start Recording (you can also assign shortcuts to it in Settings → Hotkeys. I usually set start/stop pair to F1)

Misc

To crop a window hold Alt and resize the image of the window over the canvas.
To reset resizes on a "source" click it and chose Transform → Edit Transform
To fit canvas to a source, right-click the source and chose "Resize output (source size)"
VAAPI rendering in Settings → Output is hidden for some reason unless you change the tab format at the top from Simple to Advanced.

There are pipewire-based options in the "sources", however for me nothing appears when I chose them, just a black screen. But X*-based sources instead works fine. Idk why is that, maybe some bugs in implementation on X11. It doesn't matter much though, non-PW based sources are working.
On NVidia obs may crash with CUDA_ERROR_UNKNOWN: unknown error. Have to sudo rmmod nvidia_uvm && sudo modprobe nvidia_uvm to make it work 🤷‍♂️

Supports quite a few formats, has quite a few options. Works for me. Has a tray icon, so you can start/pause/continue recording by clicking it.

I haven't used it for long recording sessions, but for short ones works well.

It has good docs on various errors. Ones I stumbled upon:

make sure to use a codec that is supported by video container (it says in a codec description when it's not supported). I think codecs that are not supported by a container should be grayed out, Idk why they aren't.