The majority of wall paint sold today is water-based, but oil-based paint remains popular for glossy woodwork, doors, and furniture, as well as demanding surfaces such as floors. There are also certain pros to using the water based paints these are low VOCs (low levels of toxic emissions) easy cleanup with water quick drying an elastic, flexible finish resistant to cracking stable color over time, without yellowing. For water-based finishes, use brushes made with synthetic bristles There are other types of paints to use as well these could be oil based paint the positives of this type of is that it has san attractive gloss good "leveling" (brush strokes fill themselves in to create a smooth finish) hard, durable finish. For oil-based finishes, you can use brushes made with either synthetic or natural filaments.
When the paint has been done it is vital that you add a finisher of some sort Matte paint is good to use as is the least reflective sheen available has a velvety texture helps hides imperfections in walls and ceilings offers great depth of color is generally considered the standard sheen for walls can sometimes be difficult to clean.