I need to choose a reliable proxy server, but I'm not very knowledgeable about it. What tips and criteria should I consider to choose a really reliable proxy for my needs?

If you are looking for a reliable proxy, make sure it has a good reputation and many positive reviews. It is important that the server is close to your location, this will improve the speed. And don't forget to check its stability so that it doesn't go down all the time. Here at this link, you can find a list of the most popular proxies.