Reading about old Scandinavian/Nordic folk-magic before it got influenced by modern Wicca for a comic I’ll hopefully make and it’s fascinating.
For example, binding knots was extremely powerful and was used for almost everything from trapping bad spirits to getting rid of warts, and the four corners of the world were all connected to the element of Air/Wind instead of Water, Air, Earth and Fire so people did certain types of magic depending on the direction of the wind (North for Resistance/Trouble/Harming Others, South for Personal Growth/Happiness/Health, East for Solutions/Luck/Love, West for Darkness/Evil/Illness) and while I know it will be tempting for people to connect this to the four elements that’s not how people at the time thought of it at all. It was all Wind to them.
This style of folk-magic is just intended to act as background flavour to give the world a more distinct Scandinavian feeling but it’s super fun to read about anyway.