150-plus free numbered lessons, alphabet first, no sign-up of any kind.
Details
An old-school free lesson series that starts with the Persian alphabet letter group by letter group and works up through grammar, everyday phrases and poetry, with audio on the lesson pages. There is no registration, no paywall and no upsell — you click lesson one and start, which is exactly why people keep recommending it. The design is dated and most of the site has not changed since the late 2010s, so treat it as a stable free textbook rather than a living course, and get your listening practice elsewhere.