If you look for ancient people, place names, poems and phrases, laws and regulations, events of the year and month, ancient cultural relics, etc. There are special historical reference books. With these reference books, you can easily find the answer.
If we look up the ancient people's views on a certain issue and their detailed practices in a certain aspect, it will be more difficult and we need to accumulate some relevant knowledge. The simple way is to look up some special history or ask experts for advice.