The gender of a noun is important to know because some words in the sentence change depending on if a noun is masculine or feminine. Notice how adjectives, verbs, and pronouns change depending on noun gender.
uhanē harā ṭarakk chalāiā sī
He/she drove a green truck
uhanē harī gaḍḍī chalāī sī
He/she drove a green car
harā (green) and chalāiā (drove) are used for the first sentence because ṭarakk (truck) is masculine whereas harī (green) and chalāī (drove) are used for the second sentence because gaḍḍī (car) is feminine
mērē do bēṭē roj khēḍadē han
My two sons play everyday
mērīā(n) do bēṭīā(n) roj khēḍadīā(n) han
My two daughters play everyday
mērē (my) and khēḍadē (play) are used for the first sentence because bēṭē (sons) is masculine whereas mērīā(n) (my) and khēḍadīā(n) (play) are used for the second sentence because bēṭīā(n) (daughters) is feminine
siāṇā banddā bhāshaṇ dē rihā sī
A wise man was giving a speech
siāṇī janānī bhāshaṇ dē rahī sī
A wise woman was giving a speech
siāṇā (wise) and dē rihā (giving) are used for the first sentence because banddā (man) is masculine whereas siāṇī (wise) and dē rahī (giving) are used for the second sentence because janānī (woman) is feminine