Honestly if you get the 3 big things the link mentions you will be ahead of many things. Recognizing when the letters aren’t joined is (I think??) very doable even for people with no reading ability. Compare these two series of exactly the same letters:

کمی فارسی بلدید

ک م ی ف ا ر س ی ن ل د ی د

The tell for which one is wrong is the one where literally none of the letters connect. This is more common than you might think.