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Hi
Facebook or Instagram would be your best choice.

Wordpress is a web publishing software, you can use to build a beautiful website
It is also a blogging and website content management system

According to my experience Ubersuggest is the best
Ahrefs, MOZ, SEMrush can also do the job for you.

SEO is one of the best practices to increase the website traffic.

SEM refers to Search Engine Marketing which is a way which involves the promotion of websites by paid advertising . this helps increasing the visibility of the website in google search results.