This is the 5918th most frequent Japanese word.
もくとう
Silent prayer.
The word "目的" (もくてき, mokuteki) is used to mean "goal" or "purpose" in this sentence, describing the aim of the project.
そのプロジェクトの目的は環境保護です。
The goal of that project is environmental conservation.
The sentence does not contain the word "もくとう" (mokutou), instead demonstrating another construct. Perhaps you meant "目標" (もくひょう, mokuhyou) for "objective" or "goal"?
本を読むことは私の毎日の習慣になりました。
Reading books has become my daily habit.
The word "目標" (もくひょう, mokuhyou) is used in this sentence to indicate an objective or aspiration, which ties closely to the context of aiming to achieve something.