Hey Tomas, You can use either of them with the verb start. As for the general rules for "-ing" and "to", that's a bit more complicated. We mostly use the "-ing" form to show an activity. E.g. I like swimming. I like football. (In both of these sentences, the word after "like" is acting as a noun). We use "to" for actions we do. E.g. He refuses to listen (He refuses to do the action of listening). Many verbs can take both forms without changing the meaning of the sentence. Other sentences can be changed by using one or the other. E.g. I stopped smoking (I was smoking but then I stopped). I stopped to smoke (I was doing something else, but I stopped doing that in order to smoke). This link has an extensive list of verbs that can use one, the other or both. https://dictionary.cambridge.org/grammar/british-grammar/verb-patterns-verb-infinitive-or-verb-ing I hope this helps!

The meaning is the same. Often you can use either form. An English professor can probably explain the difference, but often they are interchangeable.