Understanding yourself means knowing why you do what you do
Search "how to understand yourself" and you land on tests. MBTI, Enneagram, DISC, StrengthsFinder. You answer 50 questions and you get a 4-letter profile or a number. INTJ, type 5, or "top strength: strategic."
These tests have one advantage: they give you an instant result. And one flaw: the result doesn't change anything. You know you're "introverted" or "analytical," and then what? You probably already knew. The test puts a word on it, but it doesn't tell you why you react the way you do, why you get stuck where you get stuck, or why some situations drain you and others give you energy.
Really understanding yourself is a different kind of work. It's seeing the mechanisms running in the background when you make your choices. The rules you follow without having chosen them, the habits you repeat without noticing, what draws you in and why, what wears you out and under what conditions.
Why personality tests aren't enough
No test produces that kind of insight. It takes time to observe, to compare, to see the links between things that look separate. And it often starts with a simple question: what draws your attention when no one's watching?
Interests are just one angle
What you just looked at are your interests and what connects them. That's one topic. Understanding yourself also means looking at where your reflexes come from, what gives you energy and what takes it, what you value when you have to make a hard choice, and the invisible rules you apply to yourself day to day.
The Vector path covers each of these topics step by step. The exercise you just did is one of them. The next ones build an increasingly sharper picture of how you work. To go further: starting from what you reject.