$100 startup by Chris Gillebeau and listen to his podcast side hustle school.
Also a podcast called side hustle nation
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That’s a massiveeee topic haha. I’ve got tons of books I’ve read but it would be helpful to know what niche it’s for. Eg copywriting is a great way to make money online and so I’d recommend Breakthrough Advertising By Eugene Shwartz which is a really tough book to get but amazingly powerful.
DotCom Secrets: https://amzn.to/3061rSm18
Building a Storybrand: https://amzn.to/2T2aG4o16
The Business of Expertise: https://amzn.to/39UD7r915
Win Without Pitching: https://amzn.to/2T566T417
Think and Grow Rich: https://amzn.to/2unev9U16
Atomic Habits: https://amzn.to/2T5hmi417
Sell or be Sold: https://amzn.to/2QRZ80U18
I have not read this yet but I plan on it. It seems to be getting some good reviews but... Influencer: Building Your Personal Brand in the Age of Social Media 19by Brittany Hennessy