How to set up encoding on the site?

Question

HTML

On the site, you need to change a few texts and add an item to the menu. I took the order, but found that the entire site was made in windows-1251 encoding. Everything was fine, but when you change any text, it all starts to be displayed in gibberish.
In the wrong encoding, only the changed paragraph is displayed. Please help me solve the problem.

Answer 1

Then convert in a text editor. BOM is removed with a tick in Notepad, I don’t know about others

Answer 2

Coordinate the encoding of your changes and the site.
Set the correct encoding tag in the page title.
For example:
yandex.ru/yandsearch?text=html%20charset-encoding&...