New Mac users are often given bad advice that leads to mistakes when they first switch to the Mac. Don't listen to others when they advise you to immediately installer add-ons, or give you tips to customize your Mac. Learn to use macOS in its default configuration first, which is best for most users. Also avoid the habit of shutting your Mac down and instead let it sleep. And absolutely avoid installing maintenance or anti-virus apps. Most are useless and many are actually harmful.