Mark where an action takes place
The particle で marks the place where an action happens.
JLPTN5
place + で (where an action happens)~ de
[place] where an action happens
Example Sentence

Transfer at the next station
Put で after a place to show it is the setting where someone does something active, like working, eating, or transferring trains. The action verb comes later in the sentence. Use this whenever the place is busy with an event, not just sitting there empty.
Tips and Common Traps
Build the Sentence
JLPT N5Eat at the park
Arrange the words in the correct Japanese order:
で
action place / meansたべる食べる
eatこうえん公園
park