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HubSpot. HubSpot is the undisputed leader when it comes to today's inbound marketing and content marketing best practices. ...
HubSpot Academy. ...
The Content Marketing Institute. ......

Coming up with three now:

Youtube and Google seriously will provide you plenty material to get started and answer on plenty questions.
There are few platforms offering courses or MOOCs, here you...

Blogs I would recommend:
List building and email marketing: Blog | Sleeknote.com.
Conversion Optimization: Conversion Optimization Blog.
SEO: Moz Blog - SEO and Inbound Marketing Blog - Moz....