I agree with @eddieb - Kudos for starting at your age - you have a lot to learn, but a lot of time to learn it
A friend of mine used to have a picture of a tree on his office wall. It had grown from the bottom of a huge shaft and grew around 60 feet before it hed it's first branch. The caption read "No matter how dark the beginning, One who strives can reach the light ! "
There are a gazilluon ways to trade and you must choose the way which suits your personality. - Mine will not allow me to use @tommor s method, I choose turning points. But That is Hard and you need to take down bets when your head is screaming "It's going UP to the moon".
Bollinger bands do measure things which cause price to be constrained. A good start is to learn what they measure and why that would cause price constraint. I'm not going to tell you that, but I think it's a valuable bit of research you can do for yourself - then think about what effect the type of things they measure could have on the market as a whole and why that is valuable information.
When I started I was reading the share price records in the back of newspapers and thought "Well that's odd - prices just seem to go up and down" Then I learned loads and loads of "stuff" and eventually realised - that the most valuable observation I made was that first one "prices juust go up and down" - Especially in Forex. Things like the DOW and S&P are slightly different and if you like @tommor s method, you might like to look to those places.
My best advice to you is to look up the 90-90-90 rule and study why that would be ? and how you can avoid obeying that rule ! In particular, If there is so much "Great advice" out there, why does the 90-90-90 rule still hold true ? What does it say about all the "learning stuff " ?
You have to do it your own way mate - and to do that, you have to work out what "Your way" is.
Do NOT trade real money which matters to you until you are completely confident your demo accounts are making money consistently.
Lastly, If anyone recommends a book or you think of buying one - ALWAYS look up sthe reviews and read the 1,2 and 3 star ones first.
All the best.