Je bois du vin is also 'I drink wine'.
Even though there is no article needed in the English statement, you need an indefinite article while making the same statement in French. So,
- For masculine nouns, you use de le or du.
- For feminine nouns, you use de la.
- For plural nouns, you use des.
akash- du is always before a masculine noun. and de la in front of a feminine noun. Je mange du chocolat, only a part of the pieces in the box. je mange le chocolat, I eat all of it. Or if you have a choice, you use the definite article. Will you eat the salad or the chocolate?, LE chocolat, pas la salade. The chocolate, not the salad.