Hello everyone!

I'm new to QuantConnect, algorithmic trading, coding, and LEAN, and I have a lot of questions.

1. How do I use multiple indicators in one algorithm with different periods? Do I have to rename all the params? DOes the template load all the indicators beforehand and I can just use one line of code to call them, like RSI(14) and EMA(30) or something?

2. How do I use a subindicator? Like AROONdown from the Aroon oscillator.?

3. I'm getting a LOT of errors (30+) when I copy+paste my basic code from the QuantConnect web template to LEAN, and they're mostly the same thing. "The type or namespace name ____ could not be found (are you missing a using directive or an assembly reference?" How do I fix these errors?