You don't know SQL. Aside from basic CRUD statements, you haven't used any advanced database features. This free ebook will share many easy-to-copy recipes to make development faster by using a lot of stuff you probably never heard of.
Every software developer is struggling to fix slow MySQL queries. You are not alone in this.
But you can just visually see what a MySQL query is doing instead of trying to learn the incomprehensible EXPLAIN output.
Next-Level Database Techniques For Devs