How can i avoid tendonitis from typing? what are some tips for avoiding tendonitis from typing? how should my arms etc. be positioned?

Think ergonomics: Typing absolutely can cause tendinitis. Usually the tendons involved are the extensor tendons of the wrist, hand, and fingers. Try to make sure your wrists and hand are in a neutral position, take regular breaks, do regular stretching and warm up exercises before starting can all help. You might even consider asking a occupational therapist to visit and asses your work environment. Thank you.