I didn’t state that I learned it. I was asking for your help in clarification in the rules. Perhaps you’re the one who should do some learning 😂.
The rules are simple. An apostrophe indicates possession or contraction, but not plurality. Here are a few examples:
Can’t = can not
Its = possessive
It’s = it is
The horses’ coats were matted with mud = possessive
The horse’s coat was matted with mud = possessive
Forgive me for the personal question, but is English your second language? Those of us who were born here and completed Fifth Grade know these rules, but they can be confusing for those learning English as a second language.