Many people who practice paganism have an altar of some kind- even if that is not the intention.
A special place where you burn candles, maybe some incense, in an arrangement you like can be classed as a simple altar. The more mainstream religions sometimes set the impression that an altar can only be in a place of worship- this isn’t the case, and an altar can be anywhere- indoors, outdoors, temporary or permanent. If you practice ceremonies in a certain location, you may create a temporary altar under a tree, near a river, or simply some basic offerings and symbols in the centre of the ceremonial space.
Some people dedicate an entire room to magical workings and spiritual work, and there are places like this you can visit; one of these is the Goddess temple in Glastonbury. You can go there when it is open to meditate and enjoy the energies. There are also ceremonies sometimes held there too.
Ideal places for an altar
The answer to this is: anywhere! You may choose to use the mantelpiece of a fireplace, the top section of a chest of drawers or similar storage unit, a coffee table, or perhaps just the top of a small box you keep your magical tools inside. You may choose to dedicate a part of your garden if you have one, to your chosen deity or just for spiritual work. Wherever you choose to put it, and whatever you choose to utilise as a holder for it is entirely up to you- there is no specific rule to the set-up of an altar. Many people who work away from home a lot may also have a small travel altar, which can be carried in something as small as a matchbox if desired. This allows them to stay connected even when travelling.
Many altars have ritual tools on them; this could be a cup for libation, an athame for spell work, a wand, candles, space to burn incense and perhaps a representation of the God/Goddess or both. It may be that some people would want a ‘full’ altar, with everything they need for all occasions on. Some people may just want the things they are going to use for the specific ceremony or ritual included. Either way is fine, it’s up to the individual how they wish to use their sacred space.
The main thing to remember is that your altar is your main hub for spell work, meditation, ritual- many things associated with the ‘practical’ side of Paganism. Some may choose to only set up and use an altar at times of celebration; for example, the seasonal celebrations, whereas others will set up and always have their altar present.
Just remember some simple safety tips- not to use candles on or around material that is flammable and to never leave them or incense unattended, and if you rent your property, make sure first that you can burn candles and incense in the property- some smoke alarms are very sensitive, so it’s best to check instead of setting it off unexpectedly mid-ritual!