Get your post depth wrong, and the rest of your fence is fighting a losing battle. Here is everything you need to know before you dig.
Mixing bucket or wheelbarrow for post mix

Most standard fence panels are designed to fit a 6ft spacing between posts. However, there are many situations where a custom size is required. For example, you may be working with an uneven boundary or trying to fit fencing into a tight or awkward space where standard dimensions simply don’t work.