I have found a page published the Guardian,

https://www.theguardian.com/travel/2010/feb/07/learn-arabic-alphabet-table

Suggest , you go through it. I think it is built by English Speaking people and made for English Speaking readers.

Many peoples are not used to letters that change its form, depending on the location of it. It can be independant/ individual or begining or middle or at the end of a word.

The best way is to give example in a sentence ( ayat)