He is learning new skills for a career boost.

He aimed to boost his career by honing his skills.

My career plan is to be promoted to a manager within five years.

He decided to start a new startup.

He quit his job to start a new startup.

My car broke down, so I needed a jump start.

My car's battery died, so I asked my friend to jump start it.

Please press the start button to boot up the computer.

He was standing at the start line.

Star Trek is my favorite science fiction series.