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I make a site https://www.videoeffects.org/. This site is about YouTube Video Effects. I want to know how to defind the most important keyword, such as: youtube, youtube video, youtube effects.

I used some SEO tools for my site: https://www.emojionline.org. These tools said that need to integrate social networks, such as facebook, twitter... I used addthis plugin to integrate social networks. When I test some tools didn't recognize the social integration. So I want to know how to test social integration with Moz? I used addthis plugin, so if Moz also didn't recognize, what need I do?