Except "être, avoir, aller, faire" as mentioned, and "dire", which are totally irregular, and the main modal verbs (vouloir, pouvoir, etc.), which are also quite irregular, French conjugation can be more or less easy depending on your needs. If you wanna know the "présent", "imparfait" and "présent du subjonctif", there are only three general patterns. If you add the future, maybe less than a dozen. Then you may learn separately the "passé simple" and the form of the past participle (those two are not predictable).