Ask HN: How do I learn to sell?

I work in a niche between very high tech and fitness. I have many certificates since I've been in an industry a long time that supports continuing education.

A few years ago I did the NASM's business accelerator course from NPE..https://www.npecoaching.com/us/ I have found their system useful for any "service" business....you can apply it to many things...

I also have done Earn1K and ZTL from Ramit Seth https://www.iwillteachyoutoberich.com/products/ The are wonderful learning experiences, find them valuable, however they are not for everyone...they are very intense and I sometimes feel like they are "cult-ish" but it is EXTREME OWNERSHIP...