Understanding Celtic symbols is shown in the image above. Celtic history is one of the most important parts of history as it was the start of many other Religious groups and their own symbols or signs.
Words every Witch, Wiccan, & Pagan must remember not just with their heads but with their hearts & souls I have to disagree. This only applies to wiccans. It's a Wiccan religious law, and "all witches and pagans" are not Wiccan.
Candle light wards might also be another thing. I can see Tsava Leko having wards based on candles around their caravan. Though I think his own wards where originally dolls that he used to focus elemental powers into.