When I learned Spanish, I focused entirely on learning the grammar and conjugations before learning a plethora of vocabulary. As a result, I was able to speak properly given what I knew, but I often had to ask the person I was speaking to for the word I needed. In contrast, most of my friends focused on nouns like foods, weather and household objects, before focusing on the grammar.
So now, if I decide to learn another language, should I first focus on improving my grammar and learn only very common phrases and nouns? Or should I first focus on expanding my vocabulary, learning various verbs and nouns beyond what are used in common conversations?