Deciding on what language you want to learn really depends on what you want to do with it. Different languages serve different purposes. For example if I wanted to do something that involves computer animation, I may use Ruby on Rails. And if I wanted to code apps for apple products, I would use swift.
I’d say to start with an object oriented language and go from there if you want general knowledge. It may take some time to get used to the style of thinking to be able to code effectively. Python or Ruby are relatively easy to learn and you should start with one of them. They incorporate familiar English terms to make the code more understandable.
R and SQL are incredibly useful languages to know and are very versatile.
If you want to code basic websites, start with HTML then move to CSS and Javascript.