How understand code errors. Answer me

Question

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Answer 1

Look through the error, depending on the language it will tell you the line and sometimes even the reason the error occured like invalid syntax

Answer 2

Reading it, but mostly it come with practice.
When you got error you never sow, try to google it. After some time you will understand error codes much more.

Answer 3

Ok

Answer 4

And i asking which is the best application..code running..?
And show with errors