The English on the Job site also has a small dictionary about the key professional words, so make sure you start to check meanings there. You can also use any good dictionary. My personal favourite is Glosbe, but feel free to use whatever you are comfortable with in your native language. I also recommend that you don't try to translate everything, monolingual dictionaries, like Oxford, or Merriam-Webster are great at explaining the meaning of a word in English as well.