Here is a small collection of useful Blender tutorials on youtube that have I have used and still check out when I need a refresher. These are easy to understand and cover a lot of good content.
LMHPoly – This is one of the better introductions to Blender and low poly modeling basics. There is also some information on preparing and exporting your art to Unity 5 that is helpful.
GAME ASSET TUTORIAL – Introduction #1
GAME ASSET TUTORIAL – Low Poly Modeling in Blender #2
GAME ASSET TUTORIAL – UV Mapping in Blender #3
GAME ASSET TUTORIAL – Texturing in Photoshop #4
GAME ASSET TUTORIAL – Preparing and Exporting Game Asset #5
GAME ASSET TUTORIAL – Importing Blender Game Asset to Unity 5 #6
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Brackeys – I really like Brackeys videos he is clear on a lot of the useful things that can be confusing in the beginning when learning Blender. These are some Blender basics and low poly modeling tutorials that really help teach the basics and help show a decent workflow.
Blender Beginner Tutorial Playlist
Blender Beginner Tutorial #1 – GETTING STARTED
Blender Beginner Tutorial #2 – MODELING
Blender Beginner Tutorial #3 – TEXTURING
Blender Beginner Tutorial #4 – RENDERING & EXPORTING
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Surfaced Studio – A longer video that is very useful and teaches about the interface and some useful functions.
MODELING For Absolute Beginners – Blender Tutorial
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Blendercraft Creations – It is good and covers a lot fairly quickly, but it is still useful.