How do I identify Chinese porcelain marks?

This is a plate from China, it has been made late 19th century, very nice colors, black, brown blue. It is a canton plate.  

This is a very decorative Chinese Export, porcelain, Rose Medallion dish or plate which we date to the 19th century, Qing dynasty, circa 1875. I...

This is a good Chinese Export porcelain Plate which has been beautifully hand enamelled, over-glaze, in the Famille Rose palette with excellent detail, dating to Circa 1940. The mai...

This is a very beautifully hand painted Chinese porcelain blue and white Dish or Plate from the Qing, Kangxi period ( 1662-1722), dating to Circa 1680 or slightly earlier This is a well potted dish with 16 lobes or ribs, a wavy barbed rim, a very well cut foot rim and a very white glaze. The plate is very finely hand painted in a free flowing style, characteristic of the period, in varying shades of a clear cobalt blue, from the very dark to the very light blue. The central well is hand decorated with an iconic outdoor...

This is a beautifully hand-painted Chinese Export porcelain blue and white, large deep plate or dish which we date to the Qing, early 18th Century, Yongzheng period, Circa 1730. The...

An exceptional antique Chinese Qianlong porcelain plate decorated in underglaze blue and overpainted in red and green glazes with light gilding with...