Most C2 tutorials can also be used for C3, as long as it doesn't require any C2-only plugins.
Even those can be used, but ud need to use the C2 to C3 addon convertor and run the plugins in the C3 project using the C3-c2runtime.
However those tutorials with C2 only plugins if converted to C3-c2runtime might not work on mobiles... so yea... reading in more details what the specific plugin can do and compatibility with devices on the plugins original developer helps.
But i guess as dop2000 said 1st u gotta start with tutorials and manuals and stuff, to get an idea how things work.