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How to grasp the difference between bearing types

Bearing type includes front code, basic code and post code.
The basic code represents the basic type, structure and size of bearings. It is the basis of bearing code. The pre-and post-codes are the complementary codes added around the basic code when the structural shape, size, tolerance and technical requirements of bearings change.
The basic code is composed of bearing type code, dimension serial code and inner diameter code besides needle roller bearing.
Type code:
0 double row angular contact ball bearings
1 aligning ball bearing
2 self aligning roller bearings and thrust roller bearings
3 tapered roller bearings
4 double row deep groove ball bearings
5 thrust ball bearing
6 deep groove ball bearings
7 angle contact ball bearing
8 thrust cylindrical roller bearings
N cylindrical roller bearings
The double or multiple columns are represented by the letter NN.
U outer spherical bearing
QJ four point contact ball bearings