This is by far, the most I have ever typed in a tutorial! XD Hope it helps you guys out. They aren't like fancy tips or anything, just some things that have really saved me a lot of time. To be honest, that's how I learned all of this- because I wanted to find ways to save time XD. Oh lazy me.
Anywho, here is a bonus tip: It's called Layer Clipping and I use it all the time!
Beginner to Sai? Check out my tutorial: