Ask HN: What are the best programming languages for growth hackers?

I'm a marketing and business person with lots of good experience in those fields. I've taught myself HTML, CSS and some Python. I love growth and data work and want to round out my skill set, so what languages or technical capabilities would be MOST useful to focus on? I know there are a ton of 'how to become a growth hacker' threads but I'm interested in your ideas on what I should be educating myself on in terms of technical ability in order to be friggin awesome at this. Thanks.