Search Engine Optimization (SEO) – The "Organic" way, Question?

Without using Google Ads, Pay Per Click or any paid on-line advertising methods. What is your favorite strategy for Optimizing Search Engines? In other words, what strategy are you using so that the search engine spiders find you organically?

Google Seo Spider Search Engine Optimization?

I want to create dozens of blogs. I cant possibly update them all. How do I keep the search engine spiders coming back? Is there a way to keep the spiders coming back and is it legal?