Sims 4 Studio requires Blender v2.7 be used to import meshes into the program. S4Studio will automatically download 2.70a if no other version of 2.7 is downloaded on your computer. For some tutorials in this space, you will need 2.79 or even 2.78.
<aside> ⚠️ Blender v2.8 and up (which are used for blender renders and poses) are NOT backwards compatible with v2.7. If you open a v2.7 file in v2.8, the 2.7 will be corrupted and you will lose all your work. Work around to this problem found here.
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Blender Beginner Tutorial Series
Blender 2.70 (for first time users)
RavasheenCC - Blender Basics Tutorial
Sims 4 Studio - Blender Tutorial Links
Blender Camera Controls and Tools
RavasheenCC - Blender GUI Tutorial
The Draw Curve Tool for Beginners
Blender - UV Mapping & Unwrapping - Blender Fundamentals
Teanmoon - Handy Dandy Blender Cheat Sheet
Blender Full Keyboard Shortcuts
Kouukie - Proportional editing in Blender