Do I need to rebuild/reformat?

Just wondering if anyone can assist.  Fairly new to Mac having seen the light!  I used to rebuild my Windows PC's once a year with a complete reformat and fresh install of the OS.  Do you need to do the same with Macs?  Does it help?  If so how often?  Thanks.

Uninstalling a self-contained application -- one that's installed by moving a single item into the Applications folder, or wherever you choose to put it -- leaves nothing behind except the documents, preferences, and cache files (if any) that it created in your home folder. If you're a neatness freak you'll want to remove those too, which is done most easily by using an application such as Uninstaller to keep track of the files each application creates.
Third-party software that's distributed as an Installer package, or as an application that prompts for administrator privileges, isn't necessarily so easy to remove. Preferably, don't install such software at all as an inexperienced user. If you do choose to install it, make sure you know how to uninstall, because the Mac OS doesn't provide a built-in uninstaller.

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