I wan to get to the highest level of expertise in at least 4 languages. What are the most recommended top 4 for a web developer?

Answer 1

Languages: Javascript, php, python, SQL
Another needed things: HTML, CSS

Answer 2

Follow this mastering path:

1º - Html
2º - CSS
3º - Javascript
4º- PHP & SQL (if you learn just PHP it's ok, but you stay very limited in terms of handling big data - SQL with PHP will give you more power) ;)

Answer 3

HTML, Javascript, CSS and SQL