I would encourage you to have a look at few different patterns, not even things you intend to make and include things that you may think are beyond you, and look at what techniques are in them.
You will find that there are some increases and decreases which come up much more regularly than others (most likely kfb and YO for increases and k2tog or p2tog for decreases). See if you can figure out why a particular increase or decrease is used.
I am Tarriknits on Ravelry
This is my not necassarily knitting related blog