There are myriad power tools these days that can level the playing field in terms of strength. Other than that there is absolutely nothing to stop women being just as competent men if not better. In fact many women do turn out better because they are so determined to "make it" in a man's world. If you are interested in mechanics and motor technology, there is no reason at all why you should not succeed. After all over half the population are women and many own cars. The vast majority has had poor or patronizing service at the hands of a male mechanic. Imagine how good it would be to be able to see the look on a female car owner's face when she realizes she is very definitely not going to have a problem this time. Of course savvy repair shops should jump at the PR opportunities of having a female mechanic on their team.
Just like the men, mechanic training for women should cover the basic aspects of motor mechanics such as drive, fuel systems, heating and cooling, lubrication, fault diagnosis, servicing, emissions testing, and tires and brakes. Without the potential pressure of learning in what may be an antagonistic environment, mechanic training for women might also teach you a few "tricks of the trade" to help overcome any strength disadvantages such as heating and cooling jammed parts to free them, or using levers to help gain mechanical advantage. Women tend to make extremely good problems solvers since they tend to naturally be less aggressive and get on with fault diagnosis rather than losing their tempers. Try an Internet search for mechanic training women and see what comes up.