Why recommend tantalum over ceramic capacitor for voltage regulator?
The important part of the data sheet to read is this: -

So, if you choose a ceramic capacitor for the output, you might create instability in the LM1117 because a ceramic capacitor will likely have an ESR that is below 0.3 Ω.
This doesn't mean you can't use a ceramic capacitor - providing you are prepared to add a small value series resistor it will be fine. Generally, this &quot;rule&quot; applies on light loading scenarios. On medium to heavy loading, the load itself will &quot;damp&quot; the potential of the LM1117 to go unstable.