What do you mean by "Left-leaning", "Right-leaning", right-wingers and ultra-right forces often mentioned in history books?

The full name of "left leaning" is "left leaning opportunism".

Refers to a wrong idea within the party, which is characterized by impatience and rashness, regardless of objective facts; Or copy the original Marxism-Leninism, speak like a book, and can't use it flexibly.

The full name of "Right Deviation" is "Right opportunism".

Refers to a wrong idea within the party, which is characterized by weakness, compromise, fear of enemy surrender, conservative policy and line, and walking behind the masses.

The right wing refers to a legal person organization with underworld nature. Broadly speaking, the right wing refers to hardliners in conservative political parties, while the right wing supports hardliners.

The extreme right refers to the person or organization whose political position is at the extreme right of the political spectrum.

The "extreme right" is often used by many political commentators to describe some political groups, movements and political parties that are difficult to classify as the traditional right.

Some scholars use extreme right or extreme right to discuss right-wing political groups outside traditional electoral politics, which usually include revolutionary right-wingers, militant racial supremacists and religious extremists, neo-fascists, neo-Nazis and members of the Klan.

In this usage, the term is different from other forms of extreme right, such as the extreme right that is difficult to fight, or the right-wing populist.