Ask HN: How to become an SDET/automation tester/engineer?

Currently a manual software tester looking to get into an automation role for better job prospects. Thats if my presumption that an automation engineer has better prospects. Given that..

What tools and languages should I learn? i.e. Selenium, java, c#.

And what resources can you share?

Also, can you shed any light on the role itself? What kind of companies hire manual testers and what kind hire automation testers? Responsiblities, salary, ability to move into other positions, etc