Newcomer here. Trying to learn Japanese on my own for years now. Here's a first question. How can I make sure to learn correctly the difference between using を and で in the context of an action occurring in a given place. Meaning, what is correct to say:
公園で散歩します。
or
公園を散歩します。
I tend to always use で in such case, but I stumble upon を at times.