Hello 

This is the sixth day of #30 days of javascrip coding, at this day I studied the identifiers and i learned that
1-identifier  is the name of the variable which was created Therefore, you must create a correct name free of problems
2- There are rules for creating the name of variables, which we will learn about in the following lines
3- First, spaces in the variable name are not allowed and will be not valid
4- It is not allowed to start the identifier name with numbers, But we can add the number in the middle or end of the name
5-You can start your variable name with an underscore sign "_" and It can be placed in the middle or at the end of a name
6-If your name has only one name, then the first letter in it should not be Capital. Small should be better
7- The name of the identifier is very sensitive, so you must take care of the letters, whether they are capital or small
That's all I learned today

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