the Clove hitch and the Rolling hitch

This is a very important knot of only theoretical value. Without extra support, it is untrustworthy in any situation, except as a crossing knot. You have to learn it for scouting and at sailing schools.

If you have to use it, work it up properly; pull length-wise only at both ends before you load the working end. It is better to usethe Rolling hitch instead:

The best simple hitch for lengthwise pull. It needs to be laid very carefully and pulled firmly before loading. Never use it for right angle pull, for it will spill.

A video for illustration purposes:

Bron: www.realknots.com