Really Good Business Ideas

Really Good Business Ideas

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Most People Get Headline A/B Testing Wrong. Here’s How to Do It Right.
Learn how to design smarter headline tests and get real insights.
 • 
Casandra Campbell
The 10 Habits That Supercharged My Productivity (Without More Hours)
Warning: I’ve nuked voicemail, social media, and even inbox zero.
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Casandra Campbell
5
Substack Pricing Explained: What It Costs, What to Charge, and What Works
Everything you need to know about Substack’s fees, creator earnings, and how to set the right price for your newsletter.
 • 
Casandra Campbell
4
17 Free Newsletter Directories to Promote Your Publication
And 16 more you can safely ignore.
 • 
Casandra Campbell

July 2025

Why Signal Is My Default Messaging App (And Why It Should Be Yours, Too)
A quiet, powerful upgrade for entrepreneurs who want more focus, less noise, and total control over their communication.
 • 
Casandra Campbell
5
500K+ Subscribers? These 34 Publications Are Doing It
A data-backed look at the biggest Substack newsletters and the trends behind their growth.
 • 
Casandra Campbell
4
Your Next 100 Followers Are Closer Than You Think
A new study shows that the best way to grow isn’t by chasing strangers; it’s by engaging with the people already near your network.
 • 
Casandra Campbell
6
Steal Their Secrets: 23 Newsletters That Will Help You Succeed on Substack
Learn directly from the writers who’ve cracked the code. These newsletters are packed with insights on growth, monetization, and building a loyal…
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Casandra Campbell
30
Unlock Steady Growth With One Simple Tool: A Funnel
If growth feels confusing, this is the missing link that makes everything click.
 • 
Casandra Campbell
5
Everything You Need to Start and Grow a Business
No experience needed.
 • 
Casandra Campbell
Everything You Need to Know to Start and Grow a Business on Substack
No experience needed.
 • 
Casandra Campbell
1
How to Add Tables to Your Substack Posts (Without Using Screenshots)
Substack doesn’t support tables, but this free tool makes it easy to embed them anyway.
 • 
Casandra Campbell
12
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