How to decipher abbreviations in team names?

Question

IT education

Greetings!
To make it easier for me to remember the name of the command, I need to understand what it means.
For example:
1. RTRIM ( ) - used to remove spaces at the end of a column value (Postgre)
2. cls - clear the cmd terminal
How to understand the full abbreviation of such commands in a programming language? Is there some kind of lifehack in relation to different EPs?
* cls - clear screen
RTRIM ( ) - ? Right || Remove .......
I use a translator, but it's not always clear which words are used for the abbreviation

Answer 1

RTRIM = right trim