How to/tips??

I'm currently about to move back to sj possibly in the fall to attend mission and wanted to know how can I use the VTA/buses from south sj to mission? I might possibly relocate back to sj after 10yrs and I want to take the vta/bus since I no longer have a car and won't for a while but seeing the routes and such are a bit confusing. I want to start riding them before the semester starts so I can get the hang of it but if anyone can give some tips on how to read the routes and such, I'd appreciate it!