Similarities and differences between Farsi and Arabic – Alphabet, pronunciation, grammar, vocabulary, and more. By speakers of both languages.
An analysis of learning Farsi in Tajikistan (Tajik) or Afghanistan (Dari) – or even at home – as alternatives to studying Farsi in Iran, for people who can’t travel there.
The best resources I’ve found online for learning (or improving) Farsi or Persian. And many are free!