Generally, when people talk about choosing keywords for a website, what they’re really talking about is choosing keyword phrases. With a few exceptions, singular keywords are just too general.
When you run a search on any engine, such as Google, you likely assume that no one else really takes the time to look at it. It’s stored in your search history on your device, but you don’t think any outside parties are going to look at it or connect it with you specifically.
It has been shown many times that blogging is an excellent way to increase organic traffic and page rank. Blog posts help you generate consistent content, they allow you to add keywords on a regular basis and you can use them to answer questions and address issues that your readers are interested in.
Like everything, SEO evolves over time. It changes. Some of this is inherent to the practice itself; i.e., people learn more effective ways to do things and update their tactics. Some of it is due to the shifting algorithms.
