Technical SEO is the behind-the-scenes work that lets search engines reach, read, and index your pages at all: things like site speed, mobile layout, a clean structure, and a sitemap. It is the plumbing under your content.
For a small business, this is what decides whether your writing ever counts. You can build the best page on your street, but if it loads slowly, breaks on a phone, or is accidentally blocked from being indexed, none of the words earn a fair hearing. This is where speed, Core Web Vitals, a readable page structure, and a sitemap live: the unglamorous parts that determine whether your good content is even eligible to rank.
I build sites clean at this layer from the start, because a search engine or an AI assistant can only rank and cite a page it can actually reach and read. Do this layer right and your on-page work and your SEO effort finally have a foundation to stand on. Do it wrong and everything above it leaks.