Are there any mobile/tab friendly cybersecurity resources?

I have too much time to kill in my college classes, are there any Cyber Security resources that are optimised for mobiles?

Tryhackme is too heavy for a mobile/tab, books are too slow, can't watch videos in class.

The specific topic/neiche doesn't matter, anything related to cyber security works. I just want to stop wasting my time in classes.

Thanks

submitted by /u/martian_doggo
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from hacking: security in practice https://ift.tt/eRdiFkg