I remember vividly standing in John Lewis (a large UK department store) with a birthday voucher and a vague hope of taking up knitting again - after not touching the needles for over 15 years. The choice was overwhelming and I had absolutely no idea where to start in selecting something for my first project. In the end I bought a Rowan pattern book and the specified yarn/needles to make a striped sweater.

Overall, the knitting of it was a success. I remembered how to do the basics and I produced a flat, seamed sweater that was fine in all respects - apart from the matter of the too tight bind off at the neck which meant I couldn’t actually get the thing over my head.

And then I accidentally felted it, but that’s another story altogether.

The point being that if I could go back in time and tell my baby-knitter self a few things, it would be these:

Don’t bother buying a lot of straight needles. Interchangeable circular needles are so much more adaptable to a variety of projects and better for travelling and ergnomics. If you do happen to need a pair of straight needles, you can pick them up in charity shops for pennies.
Buy the good yarn. Enough said.
Don’t buy yarn just because it’s on sale. Especially the large 10x50g packs of DK/aran weight yarn unless you are absolutely certain you are going to use it. They take up a lot of space and sales are generally repeated from time to time. There are always bargains to be had.
Don’t fall into the trap of thinking there is only one way to do things. Whether it’s different cast-offs, cast-on’s, cabling with and without a needle etc, there’s always more than one way to do something and it pays to have a few of them up your sleeve.
If you are a Continental knitter, learn to throw the yarn - and vica versa. As with point no. 4 it’s good to have more than one way of doing something at your disposal and changing things up from time to time can be a good way to avoid repetitive injury.
Gauge matters. It really does. In time you might be able to wing it a little based on experience but in the beginning at least, a gauge swatch is absolutely essential if you want something to turn out how the designer intended.

How about you? Is there anything you would go back and tell yourself when you were a beginner? Do let me know in the comments.