We've all been here. Dummy or not, humans have generally always been a rather indecisive species don't you think? It gets worse when more options are presented, and the case holds at petrol stations. So much fuel at so many prices. With fuel prices plummeting as a result of the pandemic, indecisiveness congruently has skyrocketed. So what should you be putting in? The short answer - whatever your car recommends and in most cases its regular unleaded fuel.
But let's delve into it a bit further shall we. The main separations between each fuel has to do with its RON number. RON stands for random octane number and generally speaking, the higher the number, the less likely it is to prematurely combust and produce engine knock. Different cars have different engines, working at its optimum by varying levels. Which is why we have different types of fuel to cater to these engines. High performance engines tend to require fuel with higher RON. That said, some regular cars such as my sister's Golf recommends min. RON95 so you really have to check for yourself to be conclusive. This can be can be checked by looking for a recommendation at the fuel filler flap.
Now, note that this is only a recommendation. A car that's supposed to be running RON95 but filled with RON91 (or vice versa) isn't going to stop working all of a sudden. It's kinda like giving normal milk to a person that's slightly lactose intolerant. He's not going to die, but its better he gets lactose free milk right? The same goes for filling your car with a higher than recommended RON fuel. It doesn't need it and benefits little to none from it.