「雑学」というのは、trivia（トリビア）です。
このような文ができます：
「私は雑学トークを聞くのが好きです」
I like listening to trivia talks.
I like to listen to talks about trivia.
「雑学の本を読むのが好きです」
I like reading trivia books.
「彼は雑学の大家です」
He's a trivia expert.
Information that is not important is often called:
'Trivial information'
It can be the type of information that is not very important but can be interesting to listen to.
When it is in the form of a conversation with someone, especially an acquaintance it is often called small talk. That is when you talk about the weather or world facts with someone to help make someone comfortable. It can help fill the silence with someone you may not know very well.
When it is the form of a game show or competition about world facts, it is called trivia. The host asks question about past events, the longest river etc.
I hope that helps!
Food for though this means something to think about because it is interesting.It necessarily does not have to be important.
For example: "Hey, that cool idea of yours the other day has been good food for thought."
Food for thoughts（考えるための物）は内容が面白く、それについて考える事を意味しています。
ただ、内容が大切かどうかはそれほど重要ではありません。
例）
"Hey, that cool idea of yours the other day has been good food for thought."
（ねえ、先日あなたの良いアイデアは考えるための良い材料だったよ！）
Peripheral = of secondary or minor importance; marginal, secondary, subsidiary, incidental, tangential, marginal, minor, unimportant, lesser
"She will see their problems as peripheral to her ow.n"
Nonessential = not absolutely necessary (tending to be less forceful in meaning than inessential ).
"During the strike non-essential hospital services were halted."
Peripheral = 副次的な、またはあまり重要ではない、余剰なという意味。類語：secondary, subsidiary, incidental, tangential, marginal, minor, unimportant, lesser
例："She will see their problems as peripheral to her ow.n"
Nonessential = 絶対的に必要というわけではない (inessentialよりも弱い).
"During the strike non-essential hospital services were halted."
ストライキ中は、絶対的に必要というわけではない医療サービスは停止する。
Insignificant (adjective)
too small to be worth consideration
Trivial (adjective)
of little value or importance
Trivia (noun)
details, considerations, or pieces of information of little importance or value
He is full of trivia and other useless information...but he is great as a quiz partner!
When we are fascinated by tiny details or facts that are rarely needed, we are said to be collectors of trivia.
here are many PUB QUIZ games in play around the world.
However the British are especially into this as a past time...
They seem to be, as a nation, "a vast repository of useless information" (sarcasm)
ほとんど必要とされないささいなことや事実によって唸らせられたとき、'collectors of trivia'（トリビア収集家）と言います。
例えば、パブ・クイズゲーム（イギリスのパブで行われるクイズ大会のようなもの）は世界中で開催されています。
しかしながら、イギリス人は娯楽として特にパブ・クイズに夢中になっています。
イギリスは国家として「役に立たない情報の大きな倉庫」のように見えますね。（皮肉）
Fun facts
Trivia
Mindless info
I am not sure if any of these names are referring to what you are actually asking about, however, if not, you now have a couple of names for random bits of information that you have stored up in your head.
I hope this helps.
Have a great day.
Will
Fun facts（面白い事実）
Trivia（雑学的知識）
Mindless info（雑学的知識）
あなたの言いたいことと一致しているかどうかはっきり分かりませんが、これらで「多方面にわたる雑多な知識」を表すことはできます。
参考になれば幸いです。
良い一日を。
ウィル
Information or details that are not very important, but you still find to be very interesting are most often referred to as either: "trivia" or "non-essential knowledge".
Example sentence: I really enjoy learning little pieces of trivia, the information is not very important but is very interesting and fun to learn about.
「役に立たないけど面白い情報」は "trivia" または "non-essential knowledge" と言えます。
例文：
I really enjoy learning little pieces of trivia, the information is not very important but is very interesting and fun to learn about.
（雑学を学ぶのがすごく好きです。役に立たない情報だけど学んでいて面白いです）
1.Trivia
Trivia can be regarded as small details and bits of information
that are unimportant but still quite fascinating to know.
2. Minutiae
The word Minutiae is derived from the word minute -
(pronounced "my + newt") which means the small, finer
details of something.
Trivia refers to the kind of information that is random and unnecessary to know but might be asked in a game about this type of information.
Nonessential information refers more to the information that truly isn't needed to know within a particular moment or within a lifetime.
I would probably refer to this as, random information, as this kind of information has no direct purpose and isn't learned for a particular reason but rather just for self-amusement.
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