Breakeven is the stock price at expiration where your trade results in $0 profit or loss.
Long Call: Strike + premium paid = $150 + $5 = $155
Long Put: Strike - premium paid = $150 - $5 = $145
Short Call: Strike + premium collected = $150 + $5 = $155 (if assignment, you lose at this price)
Short Put: Strike - premium collected = $150 - $5 = $145 (if assignment, you lose below this price)
Bull Call Spread: Lower strike + debit paid = $150 + $3 = $153
Bull Put Spread: Sold strike - credit collected = $150 - $3 = $147
Breakevens show the profitable range for your trade.
Example bull call spread:
Wider profitable range = higher probability of profit (but lower max profit). Narrow profitable range = lower probability of profit (but higher max profit per dollar risked).
You don't need the stock to move much. Just enough to cross your breakeven at expiration. Even small moves can be profitable.
Related: Max Profit, Max Loss, Risk Reward Ratio