This is the simplified process of attaching necks, arms and legs to a body. First is an explanation of local and global space and extruding.
The difference between local and global space.
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You can change between local and global space after you've pressed the Extrude button.
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This is the technique used to join a head and limbs to a body in 3D. Keep your base polygons simple.
Mesh > Combine
Your two polygons must be merged into one shape. Make sure you are in object mode when you select them.
To snap vertices, press and hold 'V'
Window > Display > Polycount
Make sure your Vertices are merged into one
Edit Mesh > Merge to Centre
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