I've recently come across many people saying SEO traffic is low-quality and shouldn't be entirely relied on. When I first attempted internet marketing a few years ago, I relied solely on SEO (because I didn't have the money for other options), so I don't know much about other traffic generation strategies (more so for list building).
I know of basic SEO (which I still intend to use), Solo Ads and Ad-Swaps, but that is pretty much it for now. Any other important strategies I should know about? Thanks