When encountering unknown words, do you recommend looking them up in the dictionary?

We strongly recommend to just keep watching. Words and expressions come up again, and their meaning will be evident when you encounter them in a different context. You just have to make sure that the content you are consuming is at your level. If you don't understand most sentences it's better to watch videos at a lower level. The only case in which it’s okay to look up a word in the dictionary is when you encounter a certain word over and over and understanding that word is key to understanding the general meaning of the piece of content you are consuming. This does not mean any word that you encounter frequently. In almost every single case, a word that will unlock the meaning of a whole piece of content is going to be a noun that refers to a specific reality. Grammatical connectors and other function words, while you may encounter them all the time, won't be useful to understand the meaning of the piece of content. It goes without saying that all our advice is from the point of view of language acquisition. If you live in the country where the language is spoken and looking up a word in the dictionary is a practical necessity for you, then please go ahead and do what’s practical. For more about this topic, we recommend watching this video (in Spanish):