The current, modern, and typical grain if you will: language learning is vocabulary, vocabulary and maybe conversation (maybe).
Although early on in childhood, as we develop "receptive language", we are going against this grain naturally by learning phonetics first then moving onwards to vocabulary through conversation.
I was in the auto parts store and a little boy saw me bring in a battery. He said "that wuks heavy!". I replied "that does LOOK heavy". Such a correction is abnormal from adult to adult. We have more grace depending on age.
For me, an average adult, with a busy schedule, learning the difference between the English T and the Spanish T made some great headway in my language hobby. Moving onward in that direction it has helped me understand spoken language - further aiding my memorization of the actual vocabulary. My "grain" if you will: Phonetics - Vocabulary (Anki with imagery) - Conversation (with natives, when I'm able to, it's a hobby)