and so on
used in spoken English when you want to say that there are other examples of things of the same kind Don't use and so on in essays or formal writing – it sounds too vague

[TahlilGaran] Dictionary of Contemporary English ▲

etc. used when you want to say that there are many other examples of things of the same kind. The full form is et cetera, but this is rarely used. Don’t use etc. in essays or formal writing:
They asked me about my past experience, qualifications etc.
Precise details of times, dates etc. should be recorded.
such as used before one or more nouns to say that there are many other examples of the same kind. It is better to use such as rather than etc. in essays and formal writing:
It is best to avoid drinks such as tea, coffee or alcohol.
a distressing event such as the break-up of a marriage
to name (but) a few used after examples of something when saying that there are many more you could have mentioned:
Our daily activities include tennis, swimming, darts, snooker to name but a few.
and so on spoken used in spoken English when you want to say that there are other examples of things of the same kind. Don’t use and so on in essays or formal writing – it sounds too vague:
You can do things to look after yourself in the way of diet, exercise, not smoking and so on.
and many others and many other people or things:
The book includes poems by Christina Rossetti, William Blake and many others.
The college offers courses in maths, physics, computer science and many others.

[TahlilGaran] English Thesaurus ▲

and so on
And more of the same kind; and further amounts or things like the ones already mentioned.
The costumes were red, pink, blue, purple, yellow, and so forth.
Compare: WHAT HAVE YOU.

[TahlilGaran] English Idioms Dictionary ▲