You must mean like soap bubbles when water and soap splash together? Nothing to worry about. Just a combination of things you eat and drink. My pee bubbles all the time, some times more than others.
Read up on Proteinuria. An excess of protein in the urine that can cause foaming and bubbles and may indicate renal illness. Do you have high blood pressure, diabetes or are you taking certain medications? All could factor in. If you’re really concerned see your doc, obviously.
If the bubbles are generated outside your body then it is very common, the problem would be when the bubbles are generated from inside- go see the doctor…
One drop of soap in the toilet will foam up nicely. I did that for my kids when they were just learning to pee standing up. It was a great encouragement – and taught how to aim.