The Water Knot is a good knot for tying 2 ends of the same size.
Strong as the rope and won’t come undone when tension is released.
Easy to tie with gloves on.
This knot is very very difficult to undo after long exposure to extreme weight and tension.
You will need a good multitool with pliers to get this undone.
Extending a line
Creating a Loop with a single Rope