What are useful licenses/certifications that you can use in your life?

I’ve been trying to spend a lot less money on things, and spend more on investing in myself and experiences & skills.

I’m wondering what the most interesting, useful and fun licenses & certifications are.

For example, getting a real estate license, a pilots license or a CPR/First aid certification.

What are some common/less common ones ones that add a lot of value to one’s life?

Thank you in advance!