Ask What types of topics should I start with for my marketing membership site?

[SuperAffiliateX]

I'm starting a marketing membership site, but I don't know where to begin. I want to provide real value, but I'm unsure what topics will attract and keep members. Should I focus on beginner-friendly content or go straight to advanced strategies? Do I cover everything or stick to a niche? I don't want to overwhelm people, but I also want them to stay engaged.

For those with experience, what are the best topics to start with for a marketing membership site?