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Acrylic paint comes in dozens of brands and is available in either tubes or jars. Purchasing acrylic paint is one of the rare instances in which it is better to splurge and get a pricier brand, such as Golden or Liquitex. Cheap brands of acrylic paint aren’t as thickly pigmented as the more expensive brands, and will therefore require 2-3 more coats of paint to get the same vibrancy and color of a single coat of a higher priced paint brand.  To start, buy the most basic colors: titanium white, mars black, ultramarine blue, alizarin crimson, and yellow ochre. Most of the paint colors you'll need can be made from a combination of those few hues. As you paint more and more, you'll know which colors you want to add to your collection. Tubes of paint are typically preferred by beginners because you can purchase smaller quantities to start, but there is no difference in quality between a tube or a jar of acrylic paint. Paintbrushes are rather diverse and are categorized by two factors: the shape of the brush tip, and the material of the bristles. There are three different brush tip types: flat, rounded, and filbert (rounded and flat). There are many materials used to make paintbrush bristles, but the most common are synthetic and boar hair. Most beginner painters prefer synthetic brushes in an assortment of tip points.  Visit an art supply store and feel a few different brushes for a good idea of what you prefer. Synthetic brushes are softer and easier to clean than real fur brushes. Unless you’re in it for the long run, don't splurge on the paintbrushes. Although having good paint brushes to work with can be beneficial, it is more important to have quality paint. You’ll need something to mix paint on, and to store paint on between painting sessions. If you’re feeling frugal, a paper or plastic plate will work just fine. Any wide, flat, clean surface can be used as a workable palette. However, because acrylic paints dry so incredibly fast, it may be beneficial to invest in a stay-wet palette. These incorporate a wet sponge and special stay-wet paper that keeps your paint moist and workable for several weeks at a time.  Keep plastic wrap or another cover of some sort on hand to preserve paint on your palette that you aren't using at the time. If you’re mixing large quantities of paint at once, it may be beneficial to have small cups/lids to store your paint between sessions. This will better preserve the acrylics than a plastic wrap covered palette. Acrylic paint is thick and heavy, and therefore can only be used on a few surfaces. The most common and popular acrylic surfaces are stretched canvas or canvas board, watercolor paper, or treated wood. You should have success painting on anything that isn’t greasy, oily, nor very porous. If you’re afraid of painting on something expensive, start with watercolor paper and work your way up to canvas or wood. With all of the aforementioned big-ticket items out of the way, you will need a few additional items that you likely have in your home. You will need 1-2 jars/cups for water, a palette knife, an old rag or cloth, a misting spray bottle for water, and soap to clean your paint brushes. These are all available in art supply stores if you don’t happen to have them, but none of them need to be specialty items.  Because acrylic paints dry notoriously fast, mist your painting/palette from time to time to keep the paints moist.  Consider wearing a smock or old shirt while painting to prevent staining your clothes with the acrylics. Some painters like to lay down newspapers on their tabletops to prevent large messes.
Choose your acrylic paint. Select a handful of paintbrushes. Find a palette. Decide what to paint on. Gather other small items.