Dear friend...the answer is you cant understand even if anyone tell something or write something here....it is Technical thing and it is not a big issue.....it is very simple Technically.....
it doesnt matter either Auto matic or Manual car...as the goal is same....There are somthing to learn theory just read and keep it mind and write like exam...and some we need to be practice....so this is by Traning only you can acheive ur goal