Please refer below -
You can refer to https://docs.microsoft.com/en-gb/dynamics365/#pivot=main&panel=apps but I would also like to mention one another resource which is included in the SDK.
You can access the Dynamics365SDK file present in the root directory of the SDK folder.
You can search everything related to SDK and also CRM in this file and you can find good resources for the same.
Step by step document of configuring Developer Toolkit:community.dynamics.com/.../microsoft-dynamics-365-crm-developer-toolkit
Video of Installing Development Kit:www.youtube.com/watch
Video of guiding for a Post Account Create Plugin using the Developer Toolkit :https://www.youtube.com/watch?v=iw0DWYJGOi0
Hope it would help.
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