The formatting issues this post had when it was first made.
There's little content to your post beyond "here's a website. I like it. Here are some links into it" -- nothing about why you think it's good, no information about the theories or evidence behind it, no information about who made it and why we should trust their advice on happiness, etc.
I found a website called Happier Human. It's about how to become and stay happier. I've trawled through it. Here are the best posts in my opinion:
[Meditate]. Don't [worry/overthink/fantasise/compare]. [Disregard desire]. [Motivate]. [Exercise gratitude]. [Don’t have kids].
[Buy many small gifts]. [Trade some happiness for productivity]. [Set] [happiness goals]
If you've found any other happiness interventions on any website, please share them.