Hi Young_Stallion,
First -
Never wash a hot vehicle or in direct sunlight
A good washing technique involves the usage of plenty of pre-wash wet down and rinse and a good auto shampoo ( I prefer Zaino Z7, 1Z Perls, Gold Class, and I plan to try Meg 00). Whatever shampoo you decide to use make sure that it has good-excellent lubricity ( as I found out, suds are less important the slimeness - 1Z :xyxthumbs).
The next important tool and plan is the 2 bucket method. One bucket with your washing solution and one with clean water. The second clean water bucket it for dislodging any particulate matter that should have immigrated into your washing mit/towel that you just wiped off the completely panel. The second bucket may have to be changed a couple of times during a wash ( that's where patience can be put on trial

).
Wash Mit, very important and the item that will most likely cause the damage to your paint. A high quality mit/towel is essential. I prefer a natural fiber mit/towel. I presently use a DF microfiber Towel ( very soft, deep pile, allows immigration of dirt into itself, releases said dirt upon dipping in rinse bucket and hold a great deal of soapy water. I just got a really nice MF wash mit that I will try next spring when I take the black Z28 out of hibernation.
Always wash top to bottom - top/hood/truck/ upper side panels/ lower side panels, etc.
Use a separate mit/towel for wheels/tire/ fender wheel/ underchassis and alway do last unless you are going to change your wash and rinse water before proceeding do wash your paint.
Rinse completed panel well and periodically re-rinse until you are finish washing remainder of vehicle and ready to dry. This avoids water spotting.
Next potential area of concern is the final drying. Again use a high drying towel. There are many excellent products - Waffle-weave Microfibers, synthetic chamois ( takes a little practice with the blotting technique, and of course the old stand-by, a 100% high quality cotton towel.
I am sure there are points I missed that I hope fellow Autopian's will chime in and fill the blanks or post the thread that outlines what I just illustrated.
A great, no excellent resource for detailing procedures ( including the proper washing technique) is DavidB's e-book on detailing. A great reference and starting point for the basics for the perfect shine and car appearance maintenance.
Hope this helps