Basically what the title says. A few days ago I celebrated my birthday and a good friend of mine gave me a gift card for an online book shop. I was just planning on redeeming it when I noticed that I don't know any books about self-improvement, self development etc. (besides 'Atomic Habits')

So I'm curious to know which books you read and that helped you the most improving your live and your relationships. I'm very thankful for any recommendations :)