What should I learn to become a Test Automation Engineer?

[briley]

I am manual web tester and if talking about automation I can only run auto tests in Jenkins to verify the build and verify a test results for now.
Sometimes I think about switching to automation but I am afraid of amount of books and lessons I should read and watch to reach this goal.

Is it really hard to switch and it can take quite a long time for studying?
P.S. I do not have knowledge in programming and automation but I have an experience in manual testing.

[magpie]

I can say you about web automation. You need to know at least one of the programming languages that is widely used for automation (java, python, c#, javascript), xpath, css selectors, also you need to study Selenium WebDriver framework that contains quite a lot of functions for manipulating of web-elements on the web page, BDD TDD development approaches, development patterns, SQL queries, API requests (http protocol)