KanjiJLPT N2
Various

various, many, several, together

Mnemonic

A scholar speaks words on every topic under the sun—history, math, art, poetry, war, love. Students gasp as he leaps between subjects without pause. His expertise is so wildly various that no single library could contain all his words. A scholar of everything!
Additional thoughts
Picture one scholar at a chalkboard, scribbling words in every discipline, each word in a different color. The sheer rainbow of topics = various. Scholar + words = diverse knowledge.
Quick recall
A scholar whose words span every field embodies various knowledge.

Details

The keyword for 諸 is various. This kanji conveys the idea of many different things, people, or matters taken collectively. It is used to express plurality and diversity, often appearing in formal or literary contexts to refer to "all" or "many" of something, such as various countries, various matters, or various people. It carries a sense of encompassing multiple distinct items or entities as a group.
On'yomi
しょ
Kun'yomi
もろ

Used in kanji