Easy, first, make sure the power to the light is off, either by turning the light switch off or shut off the it's breaker. When you take down the existing one, take note how it's installed, and wired or take a photo. Your new fixture will have everything you need to install it.
If you have to ask it might be better to call an electrician. However, here are some sites to show you how. Just be very very careful, and if you have any doubts, call in the pros. Not worth burning your house down just for a light fixture swap out.
Easy, first, make sure the power to the light is off, either by turning the light switch off or shut off the it's breaker. When you take down the existing one, take note how it's installed, and wired or take a photo. Your new fixture will have everything you need to install it.
here are some tips - https://www.hometalk.com/diy/repair/electric/how-to-change-out-a-light-fixture-41426333
How to Change Out a Light Fixture
If you have to ask it might be better to call an electrician. However, here are some sites to show you how. Just be very very careful, and if you have any doubts, call in the pros. Not worth burning your house down just for a light fixture swap out.
https://www.dummies.com/home-garden/home-improvement/electrical-wiring/how-to-replace-a-ceiling-light-fixture/
https://www.familyhandyman.com/electrical/wiring/electrical-tips-replacing-a-light-fixture/