1. Explain it simply
This 就 means 'so then / in that case' and introduces a decision.
Put it right before the verb: 就 + verb.
It very often pairs with 吧 at the end to soften the suggestion.
2. Show examples
你累了，就休息吧。
Nǐ lèi le, jiù xiūxi ba.
You're tired, so just rest.
就 = so then
这儿的咖啡不错，就喝咖啡吧。
Zhèr de kāfēi búcuò, jiù hē kāfēi ba.
The coffee here is good, so let's just have coffee.
就...吧
你喜欢这件，就买这件吧。
Nǐ xǐhuan zhè jiàn, jiù mǎi zhè jiàn ba.
You like this one, so just buy this one.
decision
3. Share a tip
This 就 means 'so then / in that case' and usually pairs with 吧 — it goes right before the verb.