Tactics is knowing what to do when there is something to do; strategy is knowing what to do when there is nothing to do.– Savielly Tartakower
Html/CSS is a great langauge to learn for front-end development.
Another langauge to learn as a follow up after html is javascript
A few framework I would recommend would be node.js, React, vue, and angular.js
Speading some time to learn one of these will greatly help becoming a web developer.