There are many different knots for paracord. Here are some good side with explanation on these.
Knothing But Tutorials (Facebook)
International Guild of Knot Tyers – Surrey Branch
Knothing but Tutorials
Wikipedia: List of knots
Click on YouYube in the menu to find many links to good tutorials on YouTube!!
This is the most common knot used on paraord and which is the easiest to start with as a beginner.