Well where do I start?! You are going to meet a LOT of various techniques if you decide to look further into memory improvement. I am going to introduce you to the ones I feel are the most popular and worked well for me, and hopefully for you too.
I am going to start this approach systematically, so as you will learn from the ground up. It is best not to jump ahead to other sections as this will only hinder your learning curve. So to start things off, please look at the Dominic System.