Credit Spreads can technically generate a monthly income, BUT will destroy you when the market drops or changes. Destroy you totally, ALL YOUR ACCOUNT, or 95% of it.
A 5% drop in the market will damage you to the point that your account will only have a smidgen left. A 10% market correction will WIPE OUT YOUR TOTAL ACCOUNT. There are technical details regarding this, that would take a book to write.
There are many long term traders on here, who can fill you in with gory details of theory and lore, in all kinds of Spread trading, not just credit spreads. They will fill your head with curves, and statistics, and sneaky adjustments, volatility, and risk calculations, so that you will make your head spin. All very rational, complex and logical. You could say they have put in many years acquiring esoteric formulas and methods. A newbie then has to go through all this esoteric stuff and long term learning and still lose money as the market ever changes and adjusts. You are trading against mob pyschology, not theory, learning, or common sense.
My own conclusion is, we are all gambling. Being results orientated, I want to know the bottom line. How much, percentage wise of your total account did you make for this year, in the end.
It comes down to YOU ARE GAMBLING. If you gamble, you might as well toss a coin. At that rate, you have a 50 - 50 chance of winning. You can put the odds on your side, by understanding winning streaks and losing streaks. Reducing draw down during a losing streak is putting the odds on your side. Identifying a pattern that works EVERY TIME also is a good method of increasing the odds. But then you get into trading against YOURSELF. Pyschologically, you will become GREEDY. Afraid that is it. You will become fearful and panic, when the mob does not do what you expected it to do. Controlling greed, YOUR GREED is the name of the game and using gambling methods seems to give the best results. There is a reason that the EXCHANGES do not allow PATTERN TRADERS, to day trade. It works! When you extend the time period for trading, you increase the improbabilities, to the advantage of the market makers and the brokers. Your odds go up in option trading, as you shorten the time spent with a bet. That is because pyschologically you have less time to be frightened into making a mistake. To make money, your most important thing is bet size. Traditional lore and internet advice is keep your bets small. Reduce risk. But you will become dissatisfied that way, as you cannot make a living at it.