Publish site without losing SEO ranking

Hi everyone,

I have a webflow project that I published on my own web server about one year ago. I reworked the website completely, but of course, I still have a “home” site, a “about” section etc. but also new pages.

What is the best practice to publish the new site on my webserver, without losing relevant rankings on Google etc.? Are 301 redirects necessary or any other steps?

Thanks a lot!