One thing I can share from when I was first learning to knit--try to stick with fairly light colored, smooth yarns when you are first learning. Bumpy, fuzzy novelty yarns and dark colors can make stitches hard to see and mistakes hard to fix, especially when you are first embarking on the knitting journey.
Another tip--knitting needles are made out of all kinds of materials. If you have one type and are really struggling with stitches sliding off too easily or too hard, you might try a different material. It's amazing how much difference there is between metal, bamboo and plastic needles.
Have fun with your new (addicting) hobby!