Critical thinking

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What's you own understanding about critical thinking? Does it mean you will criticize others? If  not, so what is it?  For me critical thinking is about why not this or  that, for example, when I saw someone's action then I will think and ask why do you do this not  that and how can we do it better and you should do like this. I just think  about why and why people do the things like this. On the other hand how can we do it better or  even make a win-win situation. Like we all work and all of us don't want to work. For this kind of  situation then how can we persuade people who can buy  the ideas and also  agree what we do, If not then they may tell what is wrong and how to do it will better. It's totally different with  "say no and disoval" we just do things better and good for all of us. It  just like  a baby have his first step and they didn't know everything then we tell them how to do and why so that they may  understand and also do better than us compare  with our past experiences. We just think twice and ask  twice. IF there are only one way to solve the things then we may think and ask why no others  and how can we find the second way to copy with things etc. Do you agree with this point and  what's your undertanding about critical thinking ? I'm here to listen to your answer.