TL;DR:

• 1. Give them somewhere they can hide and take shelter. This doesn’t necessarily mean construction with wood and hammers, it can be growing a bush, leaving sticks and brush piles around, or letting grass grow tall.
• 2. Plant stuff they like to eat. Lettuce, carrots, clover, raspberries, blackberries; stuff with bark during the winter.
• 3. Give them water to drink.
• 4. Help them stay safe from predators. Item 1, giving shelter, is probably the best you can do for wild predators. Dogs and cats also prey on rabbits. Article says to keep cats indoors, and use a fence to keep dogs in a certain area because rabbits are smart enough to know they’ll be safe due to the fence.

And because it is a TL;DR of the article, article also reminds people about neighbors that may not want rabbits around, especially in case the rabbits eat things they are growing, and that they might take various actions to repel rabbits, counteracting your efforts. Matters way less if you have a big area or are far away from your neighbors—if rabbits coming to your place won’t necessarily mean they have a good chance to visit your neighbor too.