With so many types of bikes on the market today grouped into different categories such as XC (Cross Country), all mountain, enduro, downhill and so on it makes sense that there are certain components work better with certain bikes and trails. I'm sure you have noticed that wider tires are seen more often on enduro and downhill bikes and lighter components are more sought after for XC bikes. And of course there are all your friends and online forums members that will tell you what the best parts are and what you need to be using!
One important consideration when getting a new bike or setting up your existing bike is handlebar width. There are so many sizes out there ranging from 550 mm to 800 mm and many people like to buy wide handlebars and cut them down to the exact length they need. The width of your handlebars will affect how your bike rides and how easy it is to control in certain situations. Handlebars that are narrower are commonly seen on XC bikes (and older bikes) and wider bars are almost always used for downhill bikes. Narrow bars allow you to turn with less movement of the bars while wider bars offer more leverage with less force but you have to turn them further to get the same amount of turning as a narrower bar would give you. Wider bars also tend to be more stable while narrow bars allow you to maneuver easier through tight spaces like trees.