Which great god can tell the difference between ancient and modern characters, variant characters, interchangeable characters and simplified characters?

This topic is too big to be briefly introduced.

Ancient and modern characters:

Characters that express the same meaning have different changes in different periods, and those that use different characters are called ancient and modern characters.

For example, the pictograph "North" means two people back to back, which means "back to back". If you can't fight, you run in the opposite direction. This is called "defeat". Because it can also mean "north", it is easy to misunderstand, so future generations will add a word "meat" under the word "north" to further express the meaning and become "back". Therefore, north and back are ancient and modern words.

We often see that there is an ancient word in the dictionary, or there is an ancient word corresponding to it, that is, ancient and modern words.

Variant characters:

Due to regional differences, folk customs and other reasons, some of the same words are written differently, and there are many ways to write a word. For example, write "enough" backwards; Write the word "goose" in the upper and lower structures, and so on. Variant characters are neither ancient Chinese characters nor modern Chinese characters, let alone simplified Chinese characters. After finishing by the national writing organization, most of the variant characters are no longer used.

Common words:

A common method of "generalization" and "metonymy" in ancient Chinese, using homophones instead of words. For example, write "only" as "only" and so on. Loanwords are neither ancient nor modern, and they are not variants. Loanwords have nothing to do with their own words, but are homonyms (or near sounds).

The main reason for the appearance of interchangeable characters is that the meaning of ancient characters is not as clear as it is today, and the meanings of some Chinese characters overlap. It was common at that time.

Complex and simple words:

In ancient times, there were differences between traditional Chinese characters and simplified Chinese characters. Some strokes of the same word are very simple, and at that time they were "variant characters". Such as: books, actions, actions, etc. After the founding of New China, some variants with simple strokes were identified as simplified characters, some difficult words were simplified, and some words were simplified by radical simplification, thus forming the current mainland orthodox fonts. Most people in China outside the mainland and in some parts of the world use simplified Chinese characters, and there is a difference between traditional Chinese characters and simplified Chinese characters.