Reddit reviews Interpreting Engineering Drawings

Check to see if your local trade school or community college has a drawings class. I just took a 6 week one. It was a beast of a class with a massive homework load.

Want to self-learn, see if you library has any good old drafting books.

For something more modern you can look for a used copy of this.

I do not recommend self-learning with this book unless you want to learn how to find errors that will drive you crazy.