This is the 1243rd most frequent Japanese word.
ヶ月
"ヶ月" means "months" (used to count the number of months).
The word 'ヶ月' is being used here to quantify a period of time, specifically two months, which is the duration of studying.
私は日本語を2ヶ月間勉強しました。
I studied Japanese for 2 months.
The word 'ヶ月' here represents the span of time needed to acquire the skill, indicating a duration.
3ヶ月で新しいスキルを学びました。
I learned a new skill in 3 months.
In this sentence, 'ヶ月' conveys a point in time one month after the current date, showing a time reference in the future.