Black SEO techniques
Black hat SEO involves using marketing techniques which are against the search engine's guidelines. Employing these tactics can result in your site being penalised or banned from the index.
The scary thought of being banned from Google often results in people rejecting black hat methods outright without taking the time to think if these methods could be modified in an acceptable way.
By using black hat ideas and then altering them to stay on the right side of the search engine guidelines, it is possible to benefit without as much risk.
The black hat method:
Website owners often lose interest in their sites and do not renew them when they expire. All the links which these website acquired usually remain, even though the site no longer exists.
One black hat technique which has been used for a number of years involves purchasing expired or dropped domains and 301 redirecting them to a money site. Google often does not reset expired domains and a 301 redirect can transfer most of the link equity to the URL of your choosing.
There could be a number of legitimate reasons why you would 301 redirect a domain to another site. For example, you could have taken over a competitor or you may have rebranded an old site to a new one.
However, if you are trying to manipulate the flow of Page Rank by redirecting random sites, Google considers this to be against its terms of service. The more domains you redirect to your site, the more your risk increases of being penalised.
The white hat alternative:
Instead of buying just any expired domain, look for ones which are relevant to your niche. If you are able to find an expiring domain that is similar to your website niche, think about buying it and building it out, providing a useful resource to people who would otherwise end up on a 404 page.
Where possible, you could use Archive.org to resurrect the old site, making slow, incremental changes. At some point in the future, when it is useful for visitors, you may be able to find an opportunity to link back to articles or sections of your money website, which should result in improved rankings.
Tip: If you are going to use this technique, I would suggest hosting the expired site on a separate C class domain and using privacy protection if possible.
Like a car thief looking for an open door, spammers play a numbers game, hoping that a webmaster will automatically approve comments or accidently let one through.
Once they find a site that allows their comments, they will come back and leave an endless stream of links back to their site.
Instead of polluting the web with worthless comments, why not play a more intelligent game, leaving comments which are useful, informative and engaging on blogs within your niche.
Don’t even include a link initially. The idea is to build rapport and a relationship with the website owner.
Once you have complemented/suggested/assisted/and engaged the webmaster, they are going to be much more likely to reciprocate. This reciprocation could be in the form of linking back to some content you have created or allowing you to guest post on their blog.