best spread amount for bull put spread?

Hello, I am new to trading spreads. I know how they work, but
Is there an optimal spread amount (between strike prices) for selling put credit spreads? I know you collect more premium when the spread is wider, though it takes more money to open. I've heard it's better to keep the prices close together (within maybe $5 of each other). But in this case, you collect less premium. Is a wider spread riskier and/or more profitable?
If this information is already posted somewhere, you could direct me to it. Thank you!
Jeffrey
 
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