Dandelion Tea? Oak bark tea? Etc

Just got my Thun Calendar, and picked according to what it says dandelions today etc... but it says to make a Tea, and mentions making teas out of oak bark, and chamomile, etc and spray on the plants and soil. Does Anyone have any suggestions for these I can’t find any info and there’s no details in the calendar it just says you can make a tea and spray it whenever.