How can i improve my skills in diagnostic and repairing electronic devices and boards?

With respect to:

1-electronic devices:

use service manual and read more about its functions,then determine which one not working,next which prat is the reason(faulty) and finally,which component in that part is defected .

2-electronic boards:improve your skill in using advanced diagnostic equipments.

Generally,improve your skills in ICs datasheet,how to choose the equivalent,how to use soldering and de-soldering station

Go through the basic electronics to find most common faults in electronic cct if possible. It corrects most errors. If not get start with tools and ready to find inside. 

Asanka

VERY SIMPLE TO SAY, FIRST KNOWING HOW VOLTAGE MOVE FROM POINT TO POINT, KNOWING THE FUNCTION OF EACH COMPONENTS AND HOW THEY OPERATE. REAL TROUBLESHOOTING CONCEPT THIS ARE SOME OF THE SKILLS NEEDED TO IMPROVE YOUR TALENT