You don’t approach a toolbox and say “Is it worth it to learn wrench in 2018?”
Pick the tools for the project you need , become proficient in them. Don’t be afraid to look into your toolbox and try a new one if it’s right for the job. The more you use tools, the easier it is to learn how to use another.
Well, I won’t be designing webpages, or don’t plan to so ok. I know basic HTML, but I just didn’t know if I should invest my time in going full depth into the language.