Google Sites is good for a quick, free, simple, short-term website. Google Sites is good for something like a quick event, short-term project website, time-sensitive site - or even a simple placeholder website. If you have a Google Account, you can use Google Sites to build a website for free. If you are investing time & attention in a long-term project, Google Sites will quickly run out of tools & flexibility for most projects. For more features, explore other website builders.