I think you should learn ads early, but not rely on them too soon. Start small to understand how targeting, creatives, and tracking work, while still building organic traction. That way, you’re not forced to depend on paid traffic before you’re ready.
The mistakes I see costing the most money are usually about jumping in too fast without a foundation. If your offer isn’t clear or your landing page doesn’t convert, ads just amplify losses. Sending paid traffic to something unproven is one of the biggest drains.