I have written some articles but I want to know how to gain skill in writing SEO article. Can anyone name some sources? Thanks.

digitalpoint is ok

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Shoreditch Property| Barbican Property | Bloomsbury Property

sitepoint also is good

I believe sitepoint and digitalpoint are the most common starting ground for most folks.

Sitepronews will be more helpful

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Realtor Marketing Products

Much of what you read on digital point is rubbish, if you want the very best seo discussion that is not the place to go, plenty of BS not much substance. It's a good place to get yourself scammed as well, the place is full of trolls. Sitepoint and webmasterworld are much better.