What do you need to begin training? There are some pieces of equipment that will be of tremendous value in the long run. As we’ve talked about before, a composition book is essential for measuring progress (you can take it a step further by also logging online or in excel to see long-term trends, though for the beginner I’d say it’s optional). A well-made belt and weightlifting shoes are also very useful pieces of equipment. Shoes and a belt will last a very long time, and investing in quality will ensure you don’t “buy twice.”
As far as essentials go, that’s pretty much it. You can consider other items if the need/want arises- a pair of knee sleeves if your knees need a little extra warmth or tend to be a little achy, lifting straps if you need to do some more pulling but your grip is causing problems. If your gym doesn’t supply chalk buy your own, put it in a ziplock bag or tupperware container. If it doesn’t allow chalk, find a new gym or use Liquid Chalk. If your wrists give you problems when pressing or squatting, try a pair of wrist wraps. If you need to make smaller increases to the barbell you can buy a pair of 1lb plates. It seems like a lot of stuff but really, a composition book, shoes, and a belt will take you very far in your training. If you’re serious about getting stronger, make the investment and begin the journey.