Where do I put my extension method?

Question

A senior member here gave me this code:

public static string Truncate(this string value, int maxChars)
{
    return value.Length <= maxChars ? value : val         


        

Answer 1

Yes, use a static class. I organize in a separate project that I can use across solutions. I also organize in separate files grouped by what I'm extending such as strings, enums, io, datetime, etc