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In your desired scene, go to Window > Package Manager and in the second dropdown menu in the top bar select "All packages". Look for the "Post Processing " package, and click on "Install" on the lower right.
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Create a new layer for applying post-processing effects by selecting any GameObject, clicking on "Layer" selecting "Add a new layer" and naming it however you want (for example, "Post Processing"). Only leave that layer selected if you know why you are doing it.
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If you want to add anti-aliasing, you can select the main camera, Add a "Post Processing Layer" Component, selecting the Volume Layer you created ealier, and selecting the Antialising Mode that best suits your project (Fast Approximate Antialiasing might do the trick)
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If you want to add other post processing effects to the camera, add a new empty GameObject, add a new Post Processing Volume to it, and add any effect you would want.
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