The 2 times table lists the multiples of 2: 2 × 1 = 2, 2 × 2 = 4, … 2 × 12 = 24. "2x" usually refers to this multiplication table.
"2x" can mean 2 times a variable, but most people searching it want the 2 times table: 2 × 1 = 2, 2 × 2 = 4, … 2 × 12 = 24.
Learn the multiples of 2 from 2 × 1 = 2 up to 2 × 12 = 24. Count up by 2 each time, or drill yourself with the table above.