Manual transmissions, or, as they are sometimes called, standard transmissions, use an operator-activated clutch assembly and gear selector lever to change gears.
The operator is in complete control of the gear selected, and when that gear is selected. This is what makes a manual transmission manual. Manual transmissions are often considered less complicated than their automatic counterparts; I would agree with that. It's much easier to repair a manual transmission than an automatic. Manual transmission issues can really be broken down into two parts: clutch problems and transmission problems. Finding out which one you have is the first step to your repair.