Pattern & texture are powerful branding tools. You can use these as ways to express the secondary (or primary) brand personality traits you listed in the beginning of this course. For example, if you're a winter brand but want to incorporate more 'fun', pattern is a great place to do this.
NATural vs created
Natural patterns are things like woodgrain, marble and concrete. These patterns may be replicated digitally, but are ultimately defined by nature. Natural patterns can have a full range of personalities. Wood tends to be rustic, organic and warm. While marble in any shade is associated with luxury and elegance. Concrete is modern, cool and can be masculine.
Created patterns are those we create with shapes or elements. Think of polka dots, stripes and cute watercolor fruits. These too can span across several personality attributes. More geometric patterns can read as modern and organized. Busy, freeform patterns are seen as youthful and fun. Of course the color and subject of the pattern will highly influence the vibe it gives off.
Best practices for selecting patterns are pretty forgiving. In general you'll only need to assure that they can play well together. Much like fonts and color, you'll want your pattern palette to be refined. I'd suggest no more than 3 patterns. If using a full 3, try to connect then and create consistency by using one color for all 3 or the same style- brushstrokes, fruits, floral.