Do you guys use music theory when you compose?

Does it help?

Also I'm thinking about buying a music theory bok but there's so many

I'm only just watching youtube channels about harmony and music theory and it does help!

Cool! Do you know any good channels? Especially for harmony

These channels have got lots of interesting tips about reharmonizing, modal interchange, improvisation (which you can indeed use for composing):

https://www.youtube.com/user/havic5
https://www.youtube.com/channel/UCqimxUbWsE26KSpx2_OcmmA
https://www.youtube.com/user/JSchneidsMusic

If anyone has got good resources I'm interested as well!