Speaking only for myself, my policy is that I don't teach picking techniques unless I've personally known the person for two years.
You can find many forums on the web, but that's out of my control.
When I was new at locksmithing, I was completely fascinated by picking. Now, after 20+ years in the trade, it's an important part of the job, but not totally fascinating. There is so much more to the job.
The reasons I don't teach picking are several.
1) There is no way to know who is the person asking. Most people asking (or lurking and reading the posts) are decent people, but a few are not. So, I've decided simply not to say anything to anyone.
2) Picking locks is a "trade secret" like many other trades which have their techniques and systems.
3) A very small part of the security of locks is that so few people know how to pick them. So, by teaching lock picking, I make all locks less secure for the world. Not what I want to do.
4) Purely selfishly, I learned lock picking the hard way, with lots of practice, and you can do the same.
I wish you well. Hope this doesn't sound unkind, but the world isn't a nice place sometimes.
And in reply to your question, yes there is great danger of doing damage.