trivial
"Trivial" is a useful adjective — and occasionally a noun — that most learners encounter fairly quickly. It has a couple of closely related senses, all revolving around the idea of something being small, unimportant, or not worth serious attention.
In this sense, trivial means something is so simple that it takes almost no skill or thought to do. You will often hear this in technical or academic contexts, where someone says a task or problem is 'trivial' to solve — meaning any competent person could handle it without difficulty.
science, technology, academic language · Modern, common in technical contexts
For an experienced programmer, fixing that bug is trivial.
The maths involved is trivial — just basic addition and subtraction.
This sense connects to the word 'trivia' — small, random pieces of knowledge or facts. When something is described as trivial in this way, it relates to fun, miscellaneous facts rather than deep knowledge. You will mostly see this in the context of quiz games or casual conversation.
games, entertainment, casual conversation · Modern, informal contexts