In Facebook, how do I keep a person as my friend but stop their information on my newsfeed?

[C Wood]

On the top right bar it shows from right to left, a gear icon, a lock, your name and Home. Click on your name. Then, just below your cover graphic is a bar... click on Friends.

If you see that friend at the top of the list, great. If not, use the search box to type their name.
Below their name are two boxes. DESELECT [Following] and this should stop you from following all their posts in your feed.

THEN... if you wish to follow any of them, you can mouse over the [Friends] link instead and it will show you things you can do... to show them as close friends or just acquaintances, and put them in one list or another, and select WHAT kind of information you wish to see. That is where you can block anyone you find you have to block.
cw