If you can’t tie knots, then tie lots. A stack of Granny knots will get the job kind of done, or you can learn from an industry veteran Gaffer such as Luke Seervald.
If you want to be a grip or electric, it’s good to know some basic knots. Here you can find an explanation for a few basic knots like the Clove Hitch, Trucker’s Hitch, and Bowline, among others.