I need help starting SMM

I need Your help. All is appreciated helping achieve my life goal.
I have extremely good day job that pays well, but I decided I want to do what I like, not what I must.
So I found a few clients that agree that I take over/develop their digital marketing. I know I can do it, but I have to learn fast and a lot.
Can someone point me in the right direction, where should I start learning? Some links to online videos and discussions here on the board that You found helpful?
Most important, would...

I need help starting SMM

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