In the past, there were so many experts in DOS, maybe because there were few books back then, and we kept reading them to learn. Now, there are too many teaching materials, each claiming to be classic, and we can't even finish reading them, so we keep switching. I feel like I'm losing the sesame to pick up the watermelon. I've also browsed forums for a long time, and there are all kinds of teaching materials. Each says it's classic, and I really... don't know whose to read. Actually, I most trust the webmaster. I hope the webmaster can integrate an ordered and systematic learning teaching material for us newcomers. Let me follow through from start to finish.

