How many icons can be a site, or what else besides favicon.ico

Let's start with the fact that in general for many ordinary users it's enough to add it to the bookmarks for this. Yes, and services to create online for free, too, a lot. Some systems of creating sites more often ask you to upload an image from which they themselves will create it. It is better that the latter was a transparent background that is PNG, and had a few colors or one. 

But web technology does not stand still, at the present time, the site icons can be as much as five. iOS Safarish, Android Chrome, Windows 8 and 10, Mac OS X El Capitan Safari, Classic, desktop browsers. Of course, this is mostly for picky customers, or rather those who live in their sites all the time. So check your icons or icons can be service realfavicongenerator. Of course the image as I wrote above should be prepared. More precisely, you can get from any, but that's demanding to do SVG format will not work, the service will not generate it. 

Next, you need to download the resulting archive, unzip it and throw the files on the site. Copy and paste this code in the section before the closing tag head of all pages of the site. If everthing is done correctly, it will work!