Notes:

A website for a Polish distributor of ergonomic orthopedic products.

The menu element is used for the list of links on the left of the page. nav would be a better choice as menu is intended for interactive elements in applications. input type="email" is used in the contact form, but type="text" is used for the phone number. type="tel" can be used and has full fallback support across browsers. There are quite a few script tags in the head, so removing the type attribute would shave off a bit of weight.