I want to buy bitcoin but some places to buy btc make it so u don't actually own it, they pretty much own it. I also want to store it on a USB is there a video guide to doing that?
Not at all. There are ways to buy btc and get them directly to your wallet. For example, the same exchangers.
Do you want to buy bitcoin and save on usb? It seems that you should study the topic of cryptocurrencies in more depth, because you misunderstand how they work. In fact, it is impossible to own crypto and store them on a USB flash drive. Theoretically, you can store private keys and seed-phrases on a USB flash drive, but in fact this is not a very reasonable solution. Because this is not a reliable way due to their frequent failure. As a last resort, if you want it via USB, then you can use the hard drive option. But I would recommend that you take some time to read the info on the forum, which will allow you to use the best solution for you.