Yes, SEO again.

Let's continue with SEO vocabulary before I start explaining the methods.

On-site SEO is to build or change a website with the intention of being more attractive to SE spiders.

There are some areas of a website that the usual visitor won't see, but the SE spiders will look for, called meta-tags.

Meta-tags are like the ID of the website presented to the SE spiders, built with keywords oriented to tell the spiders what the website is all about. This keywords may help or affect the overall ranking of a website, so programmers must be aware of the keywords they put or erase in it. I.e. Salvia extracts, salvia divinorum.

Ok, so what's a spider? It's the regular name for the program of each SE in charge of checking every website to set the ranking each SE gives. Some times is called robot, or bot. But spider sounds better, because if you represent those programs graphically, you'll have a dot as a source and a lot of straight lines pointing anywhere outwards, just like the spider shape.

There's this internal linking, that is just the same as the backlinking, but inside the same webpage. So, if you have several pages in one site, you link them together, or you can direct all the links, or most of them to the page you want to be more popular for the SE spiders. There are a lot of mathematical and graphical equations to get the best result using internal linking, but some people think it's just a waste of time.

And last but not least, the content of your page. Most of people agree that spiders look for a daily or weekly variable content to give a page a high rank. Remember meta-tags? Well, it's said that if spiders find that the keywords used there don't relate to the content of the page, they would low this page's rank. This is just an hypothesis, but better to do it and not needing it than don't and to need it.

There are some other stuff out there, but they're usually experiments, nothing proven. On-site SEO is as complex as the spider's algoritm.

Like someone said in a movie: "Life is a box of chocolates, you never know what you get"

Have a great night, I'll be waiting for your comments.