This collection of resources can help you learn JavaScript at the beginner, intermediate and advanced levels.

Databricks CEO Ali Ghodsi YouTube/Apache Spark "I do think that Java was a good starting point," says Carolyn Bump, a software developer at Kohactive who graduated from college in 2017.

If you're asking what kind of software you can make, then at this point, I'm pretty sure that there is almost no class of software that you cannot make somewhat decently in JavaScript.