What is the definitive guide to Instagram growth according to Brandon SODERBERG?

Instagram itself is the definitive guide.

I always go back to what Instagram has actually said and tested, not what random “gurus” claim. For example, they’ve clearly stated things like:

1. Use only relevant hashtags
2. Mix broad, niche, and specific/branded hashtags
3. Stick to about 3–5 hashtags
4. Put hashtags in the caption, not hidden in comments

From there, the “guide” is: learn the real rules, test consistently, and ignore myths.

Are you asking about hashtags only, or overall growth (content, hooks, offers, etc.)?