Commonly called carpenter's glue, it's pretty cheap, holds well, and is easy to clean up.
It's water activated so you have to mist a dry surface before applying. A good choice if you're working with damp wood.
It's super strong and can be used to bond two different materials together, such as wood to metal, plastic, or glass
The thin version is great for getting into tiny cracks, and the thick is perfect for filling larger gaps.