Using Etc. (Et cetera) correctly in English

source: Learn English with Let's Talk     2017年7月2日
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‘etc.’ is used as a short way to say ‘so on’.
Following are the tips to use ‘etc.’ correctly:-
It is important that the items that we include in a sentence should be of the same kind.
Example: - Bring me soda, alcohol, ice cubes, tonic water etc. for the party tonight.

Do not use ‘and’ before ‘etc.’
Do not use etc. to refer to people
Do not use an introductory phrase for a list ‘such as’ along with etc.
Do not use etc. more than once in a sentence.

While speaking one can use the words ‘blah blah blah ‘instead of and so or etc.  but it is not correct to use while writing.

While writing one can also use the three dots ‘…’ instead of the word etc.  The three dots are called as ellipses.