Dreams or visions about the altar tell you that you are looking for support, help from the hereafter, the spiritual and the greater purpose. Another explanation is being connected to a partner, work, family, friends and especially to spirituality and justice; it also stands for the infinite in our cooperation.
Another explanation is that there is a chance of new friendships and relationships and connections. It could be that a beautiful time is coming with a lot of new unknown possibilities and inner or spiritual growth. Pay close attention to what you have on the altar. These objects are a deeper signal that the dream is about.
The making up, decorating of an Altar stands for connecting with your pure self, your soul and the hereafter, but especially also wanting to make the connection with your deceased loved one.
The desire for support and being heard, praying and manifesting and visualizing; the power of thought power and the spiritual connection with your higher self, the universe and co-creation. With these kinds of dreams always pay attention to the colors and materials that you use, this tells more about the underlying messages and life lessons, soul answers etc.
If you dream of a witch altar, it tells you that you have already found the knowledge and wisdom that you need at this point in your life. An alternative explanation is that you still have to match all information or knowledge and / or make yourself known, but you can also think of working out and learning to apply.
Another explanation is that you find a balance between your male and female energy. In addition, a witch altar can be experienced both positively and negatively. This depends on how you view magic and nature religions.