Investopedia has good resources for understanding the various types of options spreads. They have nice cartoon graphs that illustrate what happens in each one. For example, the page on the iron condor[0] or the straddle[1].

[0] https://www.investopedia.com/terms/i/ironcondor.asp

[1] https://www.investopedia.com/terms/s/straddle.asp