Article snapshot taken from Wikipedia with creative commons attribution-sharealike license.
Give it a read and then ask your questions in the chat.
We can research this topic together.
After the colon comes text with the class anonymous-show: The quick brown fox jumps over the lazy dog.
After the colon comes text with the class unconfirmed-show: The quick brown fox jumps over the lazy dog.
Group 1
After the colon comes text with the class user-show: The quick brown fox jumps over the lazy dog.
After the colon comes text with the class autoconfirmed-show: The quick brown fox jumps over the lazy dog.
Group 1 or redundant with sysop
After the colon comes text with the classes extendedconfirmed-show sysop-show: The quick brown fox jumps over the lazy dog.
Groups 2 and 3
After the colon comes text with the classes extendedmover-show sysop-show: The quick brown fox jumps over the lazy dog.
After the colon comes text with the classes patroller-show sysop-show: The quick brown fox jumps over the lazy dog.
After the colon comes text with the classes templateeditor-show sysop-show: The quick brown fox jumps over the lazy dog.
After the colon comes text with the classes abusefilter-helper-show abusefilter-show sysop-show: The quick brown fox jumps over the lazy dog.
After the colon comes text with the class abusefilter-show: The quick brown fox jumps over the lazy dog.
After the colon comes text with the class sysop-show: The quick brown fox jumps over the lazy dog.
After the colon comes text with the class checkuser-show: The quick brown fox jumps over the lazy dog.
Anomaly highlighter
After the colon comes text with the class abusefilter-helper-show: The quick brown fox jumps over the lazy dog.
After the colon comes text with the classes abusefilter-helper-show abusefilter-show: The quick brown fox jumps over the lazy dog.
After the colon comes text with the classes abusefilter-helper-show sysop-show: The quick brown fox jumps over the lazy dog.
After the colon comes text with the class extendedconfirmed-show: The quick brown fox jumps over the lazy dog.
After the colon comes text with the class extendedmover-show: The quick brown fox jumps over the lazy dog.
After the colon comes text with the class patroller-show: The quick brown fox jumps over the lazy dog.
After the colon comes text with the class templateeditor-show: The quick brown fox jumps over the lazy dog.