Hello there,
Please review my letter written in HTML. This is my very first assessment of the MDN community. Looking forward to seeing your critiques. Thanks!
Hi @pasha.proton and welcome to the community 
Well done!
Here are some comments:
- Self-closing elements don’t need the a slash at the end (e. g.
<br>is okay). -
<address>is for all kind of contact information, not just physical addresses. So you should also include the tel and email lines. - The four dates need to be wrapped in
<time>elements with appropriatedatetimeattribute. - Under “Subjects of study” you should use
<sup>and<sub>on certain numbers. - It would be good to use
<q>around the quote and<cite>around its source (instead of<i>.
I hope that helps. Feel free to ask questions. 
Michael