Welcome.
Thinking lasers are "quite useless" is an amazing start to being able to help others on the forum.
Sorry, I meant that most people just have fun experimenting with them. I may be wrong; this is my opinion. By the way, with all respect, I don't think yours is an amazing way to welcome new users.
Also, I said welcome.
Welcome to the forums fellow European, hope to see you around
That line about lasers being useless made me irrationally angry.
Welcome to the forum... the best advice I can give you is to leverage the search tool to mine some amazing data from the archives. You can learn anything you want here if you are willing to search
Be safe and have fun! This hobby is inherently cool, but there is a lot to know. Make it a journey!
/c