Vowel Harmony

In Turkish, we do almost everything by adding suffixes to words. There's a suffix for each verb tense, for possessives, for expressing need, and for almost anything else you'll ever want to say. You can't just add a suffix to a word and be done, however - suffixes change their form to "harmonize" with their root. Learn the rules of vowel harmony well and the rest of your Turkish journey will be much easier.