Breakeven or break even or break-even?

Please kindly help, how to know which of these is the get usage:

The best way to analyse if you are making a profit is to keep track of break-even sales.

The higher the gross margins, lesser the break-even point or lesser the fixed overheads lesser the break-even point.

Keep a tab on your break-even point, keep making sales exceeding your break-even point and the higher you go away from break-even point, the more cash you generate from your business.