I'm using Nova launcher on my Samsung phone it's just a different homescreen and app drawer really but more customisable as it lets you download icon packs, resize widgets, pick transitions for scrolling through your home screens and such.
Pretty safe really I had a silly fear of launchers for some time as I didn't really understand them but the only thing to watch out for is if you do ever uninstall a launcher make sure you set your old one back in the settings or through an app like default app manager.
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