How to do a redesign without harming SEO?

Question

CMS

There is a site that has been well pumped SEO since 2012.
But the design of the site is outdated, everything needs to be redone.
What rules should be followed when redesigning so as not to affect SEO?
The site will be located on the same hosting, on the same CMS, the domain will also remain.
There are no plans to change the structure.
Does layout itself affect SEO?
Tell me, it's very important)
Thank you in advance!

Answer 1

1 keep the same URLs
2 keep the same content on them
3 keep/add micro -markup
4 make everything mobile-friendly
5 do not worsen the download speed
6 keep/add meta tags

Answer 2

Redesign, on the contrary, will positively affect SEO. For example, while maintaining strategically important elements (urls, micro-markup, meta tags, if they are still relevant) - you can add links to social networks (if you have pages on social networks), add commenting, sharing, other social reactions for users, add customer-oriented features (online consultations, the ability to order a call back, etc.). In addition, you can significantly improve the navigation of your site by adding attractiveness to clickable tools (by changing text elements to graphic elements), adding dynamics (popup menu, slider, accordions), as well as optimizing images by changing their format to a more modern one. During the redesign, you need to remember to increase the adaptability of the site for all mobile devices.