This is the 6212th most frequent Russian word.
традиций
Traditions.
Here, 'традиций' is in the genitive plural form used to denote possession or association with 'разных народов' (different peoples).
Традиций разных народов нужно уважать.
The traditions of different peoples need to be respected.
In this sentence, 'традиций' is again in the genitive plural form, associated with 'своей страны' (his country) to express the content of study.
Он изучает историю и традиций своей страны.
He studies the history and traditions of his country.
In this example, 'традиций' in genitive plural describes the manner or basis 'уважении' (respect for which) the celebrations occur.