An alternative to sending a friend request is to follow a person whose posts you enjoy.
When you follow, the other person does not need to accept. You will authomatically be following.
When you follow someone, their public posts will show up in your news feed whether that is set to show all community posts or just people and groups you are following.
To follow another member:
Or, you can click through to their profile when you see one of their posts. There is a Follow button on the cover image. See images below.
Member tile in the list of members
Button on cover image in member profile
When you become friends with another member you will be automatically following them as well. However, if you find they post about a lot of things you don't want to read or is not relevant to you, but you still want to stay friends, then you can unfollow them.
That means your Following news feed will no longer include their posts. You can check their feed on their profile at any time.