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This post covers 10 common mistakes people make with their technical SEO.

I had the privilege of explaining to a name recently that the 5k he had just spend on his new website recently was not cash well spent. The total site was one flash file, and had no text content, making it invisible to search engines. The sad part was that the site didn’t need flash – animation things were limited to mouseovers on buttons, easily replicated using javascript.

Just because Google says they can read content within swf files doesn’t make it a excellent thought. If search engine rankings are vital, make sure there is plenty of text content for spiders to find.

When you replace that ancient Frontpage site with your swanky new CMS and completely exchange all URLs on the site, make sure you setup 301 redirects from the ancient pages to the new pages.

If you don’t, all the links you have genuinely been accumulating will now be broken, meaning Google is likely to ignore them for ranking purposes, and webmasters are likely to remove them from their sites.

Anyone who has gone through the process of building links genuinely will know how precious these are, so 301ing the ancient pages to the new pages is critical.

It takes only a few minutes to do, pay a name to do it if you have to.

Putting a terrible line into your robots.txt file is a pretty quick way to axe your site from the search results. If you don’t know what robots.txt is all about, then perhaps it’s worth thinking twice about playing with it?

Google has a tool for checking your robots file, so take the time that any changes are done correctly.

I despise this one so much. Who really knows if the H1 is weighted heavily or not in Google’s algorithm, but my gut feeling is that it is vital. I so evenly see websites where the major bearing on the page is not a H1, it’s a styled paragraph or simply a div.

CSS can be used to redefine the styles for existing page elements, such as H1 headings, so it just makes significance to use a H1 tag for your major bearing.

It’s really simple to stick a meta description into your website template and see it used on every page of your site. Unfortunately, this can axe your site from the search results pretty quickly. If you have a sitewide meta description, then all it takes is a more powerful site to steal your meta description and suddenly they will be ranking instead of you (your site will be lost in the duplicate content filter).

Take the time to use a unique meta description on every page, or leave it blank.

The splash page or flash intro page is essentially an empty page (as far as the search engines see it) with a single link to your homepage.

What this means is that your navigation structure is now one amount deeper. The page that would have beena PR5 is now a PR4, and Google visits your “homepage” less evenly (because the splash page is really the homepage).

If you really really must use a flash intro or splash page, do the right thing and add a small paragraph of text at the bottom for the search engines to see. Also place links to your other top-amount pages, not just the homepage, so the link juice spreads around the site properly.

I have seen some appealing ways of rewriting URLs, and my favourite had to be the 404 method. In the end, every page returns a 404 header, and a custom 404 handler (a php script) was used to deliver the page content to the browser.

Unfortunately, Google ignores the content and just sees the 404 error, so this site had no show of appearing in search results.

This is uncommon, but it’s worth using a small extra caution when delivering a 404 to the browser. 404s can spell terrible things for your site when you get them incorrect.

While not strictly a technical issue, nothing screams “don’t link to me” like an affiliate thin content site crawling with Adsense. If you expect to do well in the search engines, you need links, and it’s not worth losing links for the sake of a few dollars a month in Adsense revenue.

Advertising is a touch that should be added to an established website with established traffic, it’s unlikely you will get rich from advertising revenue on a groundbreaking new domain with no links.

Har har, I’ll write this paragraph of really crap content with some useful keywords and make it white on a white background so people can’t see it.

Thing is, it doesn’t take much more effort to make excellent content with useful keywords in it and make it visible to your users. People spend time making dodgy doorway pages when they should be optimising their content pages. Count crap hidden content to the homepage when they should be writing excellent sales copy.

Black hat tricks like this are an invitation for other webmasters to burn you (Google never finds out on it’s own). Previous to going ahead with a black hat scheme, look for white or grey hat alternatives first.

I once brought a site from top 60 rankings to top 20 by doing nothing other than removing 14 out of 15 versions of their homepage.They had…www.domain.co.nzdomain.co.nzwww.domain.co.nz/default.aspwww.domain.co.nz/default.asp?pageid=1www.domain.comwww.otherdomain.co.nzotherdomain.co.nzsecure.domain.co.nzsecure.domain.co.nz/default.aspetc.

Each version of the homepage had a certain amount of link authority, and the version with the most power showed up in the search results. I redirected all that link power into the main page, and all of a sudden, the rankings jumped, having changed nothing else.

Is your site wasting precious link juice on duplicate versions of yoyur homepage?

There are plenty of other ways to kill your website in the search engines, and I have deliberately skipped some of the obvious and less appealing ones. SEO is evenly less about doing things well and more about not doing things terribly – Intresting SEO Articles