What you describe is intentional vocabulary acquisition. However I'd like to point out that such words learned via this method consist only of a small portion of the vocabularies of both native speakers and L2 learners. Majority of vocabulary comes through incidental vocabulary acquisition [0].
Such methods of learning the language would make you a practitioner of the Skill-Building Hypothesis in your SLA (Second Language Acquisition) journey. Often which methodology to follow is decided unknowingly by the L2 learners, since the sources they utilize often dictate the methodology.
I believe it'd be my duty to inform you there's also a competing theory in the SLA field that you may fancy, called the Comprehensible Input Theory.