Start here if proxy terms are new to you. These posts define the main proxy types, show how they differ and explain where the IPs come from, so you can choose before you spend anything.
What is a proxy server and why use one? covers the basics. What are residential proxies? and where do residential proxy IPs come from? explain real home IPs and what ethical sourcing means. For the other types, read why mobile proxies are the hardest to detect and where static ISP proxies come from.
Comparisons help you decide: residential vs datacenter and mobile vs residential. The comparison hub has more side-by-side pages, and the glossary defines terms such as sticky session, ASN and rotating proxy.
Once you know the type you need, see residential proxies, datacenter proxies and mobile proxies for current prices.