If you blog on specific niches such as web technology and fashion, you can be sure to earn lots of money for every customer you refer to buy. You only need to refer your readers from your content and ads to make huge money.
Keyword research is a vital skill. The simplest way of describing it is that keywords are the words that people type into a search engine. And keyword research allows you to see data such as: How many times that keyword phrase is searched each month Similar keyword searches related to the keyword phrase How competitive that phrase is (i.e. how hard is it to get a blog post that targets that keyword phrase onto the first page of Google?) The SERP (search engine results page) list for each keyword phrase. This can be useful to analyze the competition your post would be up against. For example, by checking the word count for each of the top ten articles, you can get a good idea of how many words your article should be.

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This comes from authority websites that have their own programs. For large enough websites or big enough experts, they may choose to go with creating their own course. If this is a valuable course that is proven, provides great information, and they have built trust with a large following over the years then this can become a very lucrative partnership.