system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Trek] How do officers from Starfleet and other races understand how to use foreign computer systems almost immediately?

There are some exceptions, like when Data had to work out how to use a computer.  And when the DS9 crew spent a while training to learn the Jem Ha'dar system.
 
But for the most part they seem to be able to walk straight onto a ship of a species they've never encountered and know how to use a system they've never seen before, in a language they've never seen before.  They must get training to be able to interpret systems, but even so, most of the time they seem to immediately pick it up.
gpt
At the turn of the 21st century earth had already amassed dozens of computer programming languages, hardware schemas, database structures, and other complex computer systems.

By the 23rd century, imagine how many more distinct systems that humanity alone must have designed.  

Starfleet has access to not just all of human computer science, but also the other worlds of the Federation, some of which have had spaceflight longer than humanity had civilization.

At the end of even a basic introductory course at Starfleet Academy, a student would have exposure to hundreds of different programming languages, user interface schemes, data structure formats, and hardware designs.  This would probably make them *pretty darn good* at mastering some random thing they happen to stumble upon.

Also, it is not difficult to imagine that part of Starfleet engineering coursework is comparing and contrasting different approaches that the dozens of civilizations have used to solve essentially the same problem: *how not to die in the hostile, unforgiving environment of space*.