Need tutorial sources

Ok so, my last post I asked for material regarding gas detection system using IoT and python…however offline classes have stopped and there’s no chance for me to learn IoT. So I was thinking if I could learn by myself. Pleasee kind redditors provide/suggest free materials to learn IoT effectively, the ones that has easy language and in steps or if videos, with eng subtitles as I am deaf. I will be very grateful!!!!

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Original article: Need tutorial sources
Author: /u/jugsdaterad