In case you are interested, here's some information you can familiarize yourself along your Mac journey. As for apps to keep your Mac clean and fast, you can try - an excellent disk cleaner utility that automatically detects unnecessary junks, and by removing them, you can free up a lot of disk space and increase system performance. If you find one that claims it does, beware that the app is probably a scam. Thus there is no registry cleaner on Macs. Welcome to the Mac world! Well, unlike Windows operating system, macOS does NOT have (or use) Registry.
