What does Xiggi mean by "techniques"?

Sorry if my question seems any ridiculous, but when I read @xiggi 's advice about the “techniques,” I just have no idea what he is talking about. For example, here:

You will see those techniques when you start studying, but @xiggi can help us here! So many tips on his guide will help you.

I just don’t know whether he means strategies or ways to solve or answer a problem.

Also here why does xiggi wants one to learn the strategies (POE, working backwards) at the same time one is trying to answer the question?