English 'in' and 'on' are prepositions.
If you misuse prepositions, the meaning may not get across.
前置詞 is the grammatical term for 'preposition' and shares the first two kanji with 前置き, but has nothing to do with introductory remarks.
compound preposition; complex preposition; phrasal preposition
compound preposition; complex preposition; phrasal preposition
Compound of 前 (before) + 置 (place) + 詞 (word), literally 'before-placed word', a calque from Western grammatical terminology.