As long as you have the required hardware for bluetooth, you should be able to connect most devices. For example i can connect my Wonderboom speaker, PS4 controller and some random airpods i bought from aliexpress simply by turning them on.

You can use Calibre to organize your books and papers, it is a very powerful tool with a lot of options.

Imo the hardest part of linux is just finding out about the tools available out there.