1. Explain it simply
只好 = 'have no choice but to' - the only option after a problem.
State the reason first, then 只好 + the action.
Put 只好 after the subject and before the verb.
It shows a forced choice: 没有公交车了，我只好走路回家。
2. Show examples
没有公交车了，我只好走路回家。
Méiyǒu gōngjiāochē le, wǒ zhǐhǎo zǒulù huí jiā.
There are no buses, so I have no choice but to walk home.
no choice
下雨了，我们只好在家。
Xiàyǔ le, wǒmen zhǐhǎo zài jiā.
It's raining, so we have no choice but to stay home.
only option
商店关门了，他只好回家。
Shāngdiàn guānmén le, tā zhǐhǎo huí jiā.
The store closed, so he had no choice but to go home.
reason then 只好
火车走了，他只好等。
Huǒchē zǒu le, tā zhǐhǎo děng.
The train left, so he had no choice but to wait.
forced choice
3. Share a tip
只好 goes after the subject and before the action - it marks the only option left.