When blacksmithing, you can either work with a charcoal forge or gas forge. Both have their pros and cons.
The charcoal (or coke) forge is more traditional. You can get the steel hotter and you can be more selective in what parts of the work piece you heat up over the gas forge as there is more space to move the piece around. If you want to do any forge welding, the charcoal forge is usually the better choice. The charcoal forge is also messy to use and requires more maintenance.
The gas forge is clean and easy to fire up. Propane is usually not too expensive (depending on where you live of course), and a well made gas forge will be quite fuel efficient. A well built gas forge can get up to welding temperatures, but if one is using flux, measures must be taken to protect the lining of the forge. The opening of a gas forge, depending on how it’s built, can be restrictive on the size of work pieces that can be heated.
I personally use a two burner gas forge. I do have a charcoal forge, but most often the gas forge is more than sufficient for what I’m doing and it is quicker and more efficient than a charcoal forge.
Black Bear Forge is one of my favourite Youtube channels. Here they discuss the pros and cons of the two different forges…