Irish/Resources

Eus Celtic Languages
Stumm eus an 7 Eos 2021 da 00:49 gant Caoimhín (kaozeal | degasadennoù) (Copied and wikified my link list from Discord)
(diforc'h) ← Stumm kent | Gwelet ar stumm red (diforc'h) | Stumm war-lerc'h → (diforc'h)
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Free resources on the internet

Textbooks

Video series

Podcasts

Spelling and Pronunciation

Dictionaries (with pronunciation)

Grammar

Media

Apps

As for Duolingo, it's alright when you have the right expectations. I found it useful for vocabulary and just practice in general, but I wouldn't recommend it as the only thing to use.