Im an windows user and sometimes a windows hater, but i never understood why to use Linux?

It doesn't run all apps, it has strange problems, no tech support etc. Could someone explain to me why is should concider Linux and switch from win to linx`?

Does it mean i have to change my comp setup, do i have to know some programming/script language?
Is it only for advanced computar nerds who know how to change stuff in deep root system files???