More to explore:
Beginner's guide to manual mode in low light settings
Beginner's guide to using a flash
When You Should and Should NOT use a Flash
tips for getting indoor photos in low light
Window Light Tutorial- the ONLY way to shoot indoors.
Beginners guide to external flash from @AmandaPadgett.
8 simple, easy-to-follow Photoshop tutorials for better photos.
Low Light #Photography Tips for beginners
Beginner Photography Video