Forsyth County NC was formed in 1849 from the southern half of Stokes. As early as the 1740s it was part of Anson Co, then Rowan, then Surry, Stokes and finally Forsyth.
The history of what is now northern Forsyth Co, particularly north and northwest Forsyth, has become a hobby of mine in recent years. The following are some excellent resources for researching the NW and northern parts of Forsyth Co.
Judy Cardwell has some excellent documentation on her website of the old wagon roads and deeds plotted (and overlaid) on modern maps. Two pages of particular interest to me are her pages on Charles Vest Sr and Some Early Wagon Roads of Northwestern Forsyth County. Judy has put a tremendous amount of research into her work and has been super gracious in sharing her research.
Another excellent resource is Kay Haden's site concerning Gideon and Hezekiah Wright. Kay has tons of research notes available, especially on the pages under the link "Descendants of ??? Wright" (the father of Gideon and Hezekiah).
A wonderful book by Beverly Hamel on the history of Bethania covers a myriad of historical issues from the mid 1700's to date, using the Moravian diaries, and many other resources. Her book is entitled Bethania: The Village by the Black Walnut Bottom, and is available at Amazon.com (follow the link).
Two excellent resources for researching deeds are the Forsyth Co Register of Deeds and the Stokes Co Register of Deeds. Both have their deeds imaged and available online.
Another good map is of the old Wachovia Tract, placed in modern Forsyth County.
Another good map (thanks to Bev Hamel for pointing it out to me) is the 1770 Collet Map of NC. This is stored online and you can zoom in and out.
Surry County NC Wills 1771-1827 by Jo White Linn is a good resource to have.
I'm sure there are many more online resources, but I'll start with these and add more as they become evident.