I think you should explain what do you mean by "one website with multiple domains". Are those domains redirected to a main domain? Are we talking about masking?...

Yes, It is good for SEO, but it can not help you in the ranking. If you are targeting other countries with domain Extention then it will help. Like Pinterest, Amazon

Use FB tracking pixel to identify your site audience and later only target this audience. It should convert much better, because they already know your site and brand.

Hi Jack, Thanks for share your question. Conversion Pixel tracks user activity on the website. It's a small library of functions that you can use whenever a site visitor...

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Black hat SEO techniques are Duplicate content Keyword Stuffing Link Farming Hidden link Paid links Article Spinning

@matthewsstephen12 Could really be 5. negative (as long as content is not SPAM, super low quality, duplicity, etc...)? Haven't experienced such a scenario yet. Sometimes,...

Ranking fluctuation reasons: Google Algorithm Changes. Major Algorithm Updates. Sudden Competition. Sudden Trends. Temporal Interest. New Content Added. Old Content Remo...

you should use google keywords planner to find the search volume and cpc for your keywords. You can also use ahrefs, it's the best tool for research of keywords.

BRAVO! You add almost all the techniques.