You can find some free resources on google and youtube to get started. I also share my strategy and trades in private.
With S/R traders every time a zone or S/R line is respected the stronger it is and has a higher probability of working.
As for S/D traders the concept for them is that the more times a zone is tested so weaker it is because S/D traders believe the unfilled orders of the institutions are getting filled.
My group members were having a discussion on this yesterday, and this is what one of them had to say about this: https://imgur.com/a/zqqJtIC
Which is the best interpretation of the two I have seen so far.