ok, here we go Correct me when i’m wrong, people )
i’ll start with the very very basics: vowel harmony

vowel harmony rule is importait when you want to choose the right suffixes (for example, how will you choose which suffixe for plural (lar/ler) to use not knowing the vowel harmony rule?).
The rule is this: you choose the suffix for words according to the last vowel in that word: after front vowels (e, i, ö, ü) you add suffixes with front vowels; after back vowels (a, ı, o, u) you add suffixes with back vowels).
Let’s practise with the plural suffixe lar/ler:
kitapLAR (books)
masaLAR (tables)
koltukLAR (armchairs)
babaLAR (fathers)
—
kalemLER (pencils)
anneLER (mothers)
silgiLER (rubbers,erasers)
gözlükLER (glasses. not the ones you can have water in, but the ones you wear to see better. )

your task would be to write plural forms of these words:
bardak (glass. the one you can have water/wine/etc.)
tabak (plate)
kulak (ear)
dudak (lip)
göz (eye)
gül (rose)
yıldız (star)
otobüs (bus)
araba (car)
köpek (dog)
kedi (cat)
sınıf (class)
öğrenci (student)
bilgisayar (computer)
sınav (exam)
okul (school)
öğretmen (teacher)
kardeş (sister or brother)
arkadaş (friend)
sabah (morning)
gün (day)
akşam (evening)
gece (night)

by “valentina”.