There are a few different types of markers that can be used on wood. The best type of marker to use will depend on the look you are trying to achieve and the type of wood you are working with.
Permanent markers are great for writing on wood because they won't fade or smear over time. They can be used on any color of wood, but they will show up best on light-colored woods. Sharpie is a popular brand of permanent marker.
If you want your writing to have a more natural look, try using a pencil or charcoal pencil. These types of pencils can be sharpened to create fine lines or broad strokes, depending on what look you're going for. Just like with permanent markers, lighter colored woods will show off your work better than darker woods.
Finally, paint pens are another option for writing on wood. Paint pens offer more control than standard paint brushes, so they're perfect for creating detailed designs or lettering. They come in both water-based and oil-based formulas, so make sure you choose the right type for your project. Water-based paint pens will work best on porous surfaces like unfinished wood, while oil-based paint pens are ideal for non-porous surfaces like varnished wood.