GET A BLOODY GOOD KNIFE!
I cannot bang on enough about how important it is to have a good quality sharp knife. For me this is my most used & important bit of kit in the kitchen.
It doesn't need to be super expensive. The main thing is that it is comfy to use & you feel at home using it. I used £30-£40 knives for my first 20 years of professional cooking, but I really looked after them (more on that later)!
Do not choose a knife because it has a large price label or looks the part. Does it feel natural in your hand? Does it feel nimble? Does it feel easy to use? - Then it is the knife for you!