Color grading basics
I would look at some of the tutorials on YouTube. There are plenty of them. 

If you want to get into grading; you can jump right in as long as you are shooting RAW; or at the very least; 4:2:2. 

If you're shooting 4:4:4; you have a lot of flexibility. 

Resolve's DaVinci Line has some nice low cost entry options that include control surfaces; I personally use a Tangent Wave with Resolve to grade RED material; it's fast and very robust. 

It's important you look into workflow, that is; are you applying filters; or merely manipulating the metadata XML; as with RED footage. Each camera/codec/software will have it's own unique pipeline in terms of how you grade. 

I would invest in a Spyder; and calibrate your monitor. You want to grade in a room that is lit to 70% ambiance of your monitor's brightness. So your monitor shouldn't blind you. Your color temperature needs to match as well; so if your monitor is 5600K; make sure all the bulbs in your edit room are 5600K; or your eyes will play tricks on you. 

But on YouTube there are plenty of in depth tutorials; just keyword davinci resolve tutorial and you'll see.