Many witches opt to have a dedicated spell space or altar. Note. AltAr not AltEr. Unless you have decided to follow Wicca, you do not need to have a specific set of items in specific locations on your altar. Many secular witches adopt Wiccan altar practices, because that is the information that is readily available. However, as a non-Wiccan witch, you can do literally whatever you want.
Used as a heat proof surface, and is typically used to house smoke cleansing supplies