Putting a subscription box on a page is not list building, and Merle Gibbins says so before explaining what actually is. Her posts on the tools that collect addresses, including a two part review of one popular pop-up product, are the most practical thing here, because they assume you have a blog and no idea how to make it collect anything.
She covers using affiliate products and private label content on your own site, with the tradeoffs stated rather than glossed over.
A separate run promotes an aloe vera range, on the cream, the nectar and what the company claims for them, and those posts read as promotion. There is also a short piece on identifying multi level marketing scams, which sits oddly next to the product promotion and is better for being there.
Her best marketing post deals with the prospect who is interested but reluctant, and treats that as a specific problem with specific answers rather than as a failure of enthusiasm.
Start with the list building posts if you publish regularly and collect nothing.