Need guidance for mobile security

Hi everyone. I am new ‘script kiddie’ in this info sec world. Currently exploring ‘mobile security’.
I have tried some books and blogs. But I am not understanding well by this. There are some good online course but I can not afford to buy them now.

Can anyone recommend any video tutorial (freely available) for ‘mobile security’ ?

As a new student, it becomes hard sometime to find a good resource. That’s why asking for expert help.

Thanks.

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