I have a Bluetooth keyboard case for my Android tablet. All the time, I use Termux to ssh into my Linux machine over my home network and code on it in Neovim from my couch.
I don't bother with the default notes app on my phone. Termux + Neovim running vimwiki and syncing to a private GitHub repo is way better.
Most stuff you want at the CLI is in the Termux package repository. On the occasions when it isn't, you can install clang, make, cmake, ninja, whatever libraries you need, and build it from source. At that point most stuff just works.
Termux is incredible and single-handedly keeps me running Android.
The main one I use with my Android tablet specifically is a no-name brand, knock-off "magic keyboard"-style folio case that I got on AliExpress for like, 45 USD. I ordered the English layout, I received the Spanish one (which is mostly the same but had additional legends for Spanish characters). Le sigh. It's AliExpress, I didn't bother contacting support.
For my phone, I have a really old Zagg one that was originally for an iPad. The iPad has long since died but the keyboard lives on. Woo!
The main keyboard I type on all day at my desk is a Logitech Pebble K380s. It can store three different connection profiles, which can be either Bluetooth or Logi unified receiver. So I have one of those profiles set to connect to my Pixel 8 via Bluetooth (typing from that now). Makes toggling back and forth between that and my desktop very smooth.
On a "real keyboard" (like this K380s) there's a dedicated Esc key. Most tablet folio cases don't have Esc. I found an app called "External Keyboard Helper Pro" that lets me rebind Caps Lock to Esc. That makes Neovim much more pleasant.