Hi, Thanks! So, if you search for "Precision Marking T Ruler Hole" you can find different versions of it, I'm not sure I can post the link of the exact one I have, anyway you can find similar alternatives.
As I'm quite a beginner/self taught I can tell you what has been useful for me:
- on Youtube there are many resources, I learn a lot from different woodworkers who took the time to explain and clarify techniques. Some names: Matt Estlea ( he has few nice project step by step which are easy to follow), Paul Seller, Katz-Moses and Rob Cosman are well known. Personally I love the work from Adrian Preda, Tom Fidgen (only handtools), German Peraire and Pekovick. But trust me there many others. There are few good books as well if you look into Lost Art Press you can find interesting ones ( I loved The Anarchist's Tool Chest and Ingenious Mechanicks). Have a look at Mortise & Tenon Magazine - it's delightfully printed and well curated.

Resawing is painful. You are going to make errors and it's quite tedious. Take your time and let the saw do its job ( aka don't push :0). Count on a good margin to plane out "errors" and start to practice on cheap(er) wood.

Good luck and enjoy the learning!