How to optimize a site in search engines, html and micro-markup?

Question

Search Engine Optimization

Good evening, dear users, I initially faced such a task
- How to make the site the most favorable for search engines and user-friendly?
I read articles on the topic of micro-markup, various twitter cards and open graphs (fb & vk).
And it turned out what happened, I would like to hear your opinions: what was done correctly, and what, in your opinion, needs to be corrected, are there any mistakes. In which direction to work, I will be grateful for any positive and critical comments, thanks
Address: Link to the site