Ok start here (Fundamentals of Rigging) – and make sure you submit your work, this is probably the most important part of your learning.
Even if it’s “Easy”.
You can’t learn to swim by watching someone in the deep end of the pool. You practise in the shallow end, make mistakes, learn and progress.
If you jump straight into the deep end – you’re going to sink.
Hard surface rigging isn’t really any different to organic rigging other than most of the time you don’t need to do as much weight painting.
You will learn all of this in the Fundamentals of Rigging.
Go, Samy, Go.
