還好 can mean okay, not too bad, or barely fine

還好 looks simple: still good, or okay. But in conversation, it can carry a wide range of feelings. Depending on tone, it can mean "fine", "not too bad", "so-so", or "I am being polite but not impressed".

That range makes it a phrase learners should listen to carefully.

Plain okay

If someone asks how your day was, It was okay can mean the day was fine. Nothing dramatic happened. It was acceptable.

In this use, 還好 is mild and neutral. It does not sound excited, but it is not negative either.

Soft understatement

Now imagine someone asks whether a movie was good. If you answer It was just okay, the listener may hear that you did not love it. The words are not harsh, but the praise is weak.

This is the important learner trap: 還好 can sound less positive than "good". It often sits in the middle, and the middle can be a polite way to avoid stronger criticism.

Relief: good thing that happened

還好 can also mean "fortunately" or "luckily". Good thing you reminded me means something like "Good thing you reminded me". This is different from the "so-so" meaning, but it grows from the idea that things are still okay.

Listen to tone and context

The phrase 還好 is not dangerous, but it is easy to over-read. A flat 還好 may be very mild. A relieved 還好 may mean "thank goodness". A hesitant 還好啦 may mean "not great, but acceptable".

Do not translate it too quickly. Listen for the emotion around it.