Here you will find lots of good-practice advice for working at the PC in your office, your home set-up and your laptop - wherever you use it.
General guidance for home or office
1...Adjust the backrest of your chair to fully support your lower back, and sit well back into the chair.
2...Adjust the seat height until your forearms are horizontal and wrists straight while using the keyboard. Bring the keyboard close to the edge of the desk just leaving enough room for a gel filled wrist rest if you want one or to rest the heel of your hands. Avoid- pushing your keyboard forward to keep papers in front of it. If you do this you will probably lean forward to reach it and your back will no longer be supported by your chair. Do not rest your wrists on the edge of the desk or bend your hands up at the wrist. Keep a soft touch on the keys and do not overstretch your fingers. Place the mouse right beside the keyboard so that you do not have to stretch - use a mouse mat with a gel filled wrist rest if you wish.
3...When you have the seat height right, if your feet do not rest comfortably on the floor use a footrest – get a purpose made one or a suitably sized box.