effective vs efficient ~兩者不同處

effective=>有效果的
Window screens are effective in keeping out mosquitoes.
紗窗能有效地擋住蚊子
efficient=>有效率的
He is an efficient manager.
他是一位辦事效率高的經理
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所以effective指的是結果有達到目的
=>紗窗有達到阻擋蚊子的目的
而efficient指的是時間分配的很好
=>經理很會分配自己的時間
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希望對您有幫助

Effectively Vs Efficiently

Efficient: (效率)
If someone or something is efficient, they work well without wasting ti
me, money, or energy
形容行動上及動作上的省時，省時，省金錢

Effective: (有效)
什麼樣的方法對什麼是有效的
可以說XXX對XXX是有效的或可以被解決
在形容上事物或東西上是比較具體的

咖哩's explanation is pretty good. I would like to add:
Effective today, all staff will get a 5% raise.
=> Here effective means 生效
(You cannot use the word "efficient" here)