if, after, when
A conditional that sets up a condition or sequence, meaning 'if', 'after', or 'when'.
たら is a very common conditional in everyday Japanese. It expresses a condition or a sequence: if A happens, then B; or after A happens, B. It's often used when you want to say 'when' for a specific event, like 'when I get there' or 'after I eat'. It's also used for advice with いいです, like 'You should...' (literally, 'if you do X, it's good').
Unlike ば and と, たら emphasizes the completion or occurrence of the first action. It's also more flexible: you can use it with states, events, and even suggestions. In speech, it's very common and friendly. Just remember to use the past tense form as the base, which is why it feels like 'if it happened'.