Throughout the chart, you can see dashed areas (broken lines around it) and a number in a box. These refer to the boxed numbers in the legend in the "CAT AREAS" column. These are areas of Clear Air Turbulence, usually associated with jet streams (the big black lines and arrows you see). The icon next to the boxed number in the legend tells you how much turbulence you can expect. -^- means moderate turbulence, if you get that symbol with an extra ^ above it, that means severe turbulence (= not nice). There's also two numbers beside each icon, for example 420 and 340, which means the CAT area extends from FL340 (34000 ft) up to FL420 (42000 ft).
As you can see, light turbulence is not noted on the chart but you can expect this near jetstreams (especially entering them or exiting them, many times IN the jetstream itself, it may be completely smooth) and in the clouded areas, which are usually thunderstorm activity.
So now you can also check if you'll have a headwind or not. When you see a solid triangle attached to a jetstream vector, that counts for 50 knots and each attached line counts for 10 knots. Just add them up and you have the wind speed. The FL near the windspeed indicator tells you how high it is at max intensity.