A brand is a feeling, not a logo
Ask most people what a brand is and they'll point at a logo. That's like calling a person's face their personality. A brand is the gut feeling someone has about your business — the sum of every impression, promise, and experience that adds up to "these are the people I trust with this." Brand strategy is the deliberate work of deciding what that feeling should be, and then earning it.
Without strategy, a brand forms anyway — it just forms by accident, out of whatever impressions happen to land. That accidental brand is usually vague, inconsistent, and easy to forget. Strategy replaces the accident with intention: it decides, on purpose, what you want to be known for and who you want to be known by.
This is why strategy comes first, before logo design or colors or a tagline. Those are expressions of the brand. If you design them before you've decided what the brand actually stands for, you're decorating a house with no blueprint.