Patterns for baby booties?

Hi everyone, as my sister in law is pregnant, I wanted to make some socks / booties for her baby. I've never done that but I've been knitting for some time and I didn't think I would struggle that much..!
I tried Drops' Lavender Socks but it's a mess, and I've been making the same unknown mistake three times so I'm giving up.

Do you have easy patterns you would recommend for baby booties?

Thank you for your help!