what is the meanings?

~I am stupid enough to do some things.~
will be better than
~I am stupid to do the things.~

~It's stupid for me to do some things.~
will be better than
~it is stupid to me to do the things.~

because the use for the thing/things that you know and the person who talk to you also know what you talk.

fristly, you should ask 'What does it mean?'

'learn to do more for less' practically means 'it is stupid to me to do the things.' it is something like '唔怕蝕抵'

Learn to do more for less
意思大約是:
要學習(Learn)用好的方法、容易的方法(less) 去做一些困難的事、做多一些事(More)。做事要用腦！

learn to do more for less 即是學習去做多少。
Correct: I am stupid to do the things.

it is stupid for me to do the things.

It means you are quite stupid to do the item
try to think/do it other way/mean to get better result.

That's means you are criticized to be clever.

I am stupid to do the things.