You can use both start and begin for an activity. "Begin" is more formal than "start":

I started playing the piano when I was 8 years old.

What time does the meeting start?

He's beginning to read more advanced books in English.

We left the park when it began to rain.

When you turn on a car or vehicle, use "start":

I had to call a mechanic because my car wouldn't start.

In general, begin is used for more formal and more abstract ideas:

Scientists are studying how life began on earth.

World War II began in 1939.

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Garlic

Garlic may help stave off some forms of brain cancer, according to research published in Cancer, the medical journal of the American Cancer Society. Investigators found that the organosulfur compounds in garlic actually worked to kill glioblastoma cells a type of malignant tumor cell.