How to say "Start" in Japanese

When translating "start" into Japanese, you must choose carefully between 始める and 着工. In Japanese, 始める (はじめる (hajimeru)) is typically associated with "to start (something)" (Syllabus Level: N4) and represents Transitive verb. To initiate an action or activity.. On the other hand, 着工 (ちゃっこう (chakkou)) maps to "start of construction" (Syllabus Level: N2) and represents Specifically refers to the commencement of construction work on a building or project. Often used with 「する」. A literal translation of "start" can often sound unnatural to native Japanese speakers if mixed up!