I promise to invest the little money I have after knowing how is works.
I don't know if I care about the amount you would like to invest in bitcoin or not and why you promise.
But welcome, OP.
If you're an adult, and you've found a great topic for beginners, the best thing you can do is start reading the forum. But this way you can notice that you are in a hurry and want everything at once, then you are now given a bunch of links that are usually sent to beginners. Read, study, and move slowly.
A fair remark, which is often observed here. There are two types of beginners. Some fly into the forum and demand that everyone provides them with mentors and teaches them step by step. Such people quickly leave the forum.
And there are those who read slowly and achieve everything on their own. And they are the backbone of the forum.
You have a choice of who you become here.