Sheet Bend
The sheet bend is very similar to the bowline, except that it uses two lines instead of one. The purpose of a sheet bend is to join two pieces of line of different diameter. If you are wanting to join two pieces of line with the same diameter, a reef knot is probably what you want.
How to tie it
Step 1: Make a loop with one end 
of the line, making sure the tail is under the short end.
Step 2: Using the end of the 
other line, put it up through the loop.
Step 3: Bring the end around 
the tail of the first line (the one that makes the loop).
Step 4: Take the end back 
down through the loop and pull it tight.
Common Errors
This knot is one of the more tricky ones. Because of that, there are several common problems people encounter. These are:
- not checking that the tail is under the short end in the initial loop
- mistaking the short end for the tail in step 3
- not bringing the end back down through the initial loop
For more help, watch the demonstration video and remember the saying "the rabbit goes up the hole, around the tree, and back down the hole", where the rabbit is the end that you are tying with and the tree is the tail.
