Use e.g. with a comma when you are introducing a short list of examples

There are many good dictionaries on sale nowadays e.g., Chambers, Longman, and Collins.

Use etc. when it is obvious that you are referring to a long list

There are many types of dictionaries: monolingual, bilingual, slang, etc.

These are very common abbreviations derived from Latin and shouldn't create any difficulty of comprehension with the vast majority of English speakers. But if you are writing a formal report, paper, proposal, etc. Or your audience might be unfamiliar with their meanings e.g., non-native speakers, then by all means use their English equivalents “such as”, “for instance” and “for example” can substitute e.g. Either “and so forth” or “and so on” can replace etc..

It is considered poor style to use different abbreviations such as: ex, EX, and to use more than one period after etc. So, avoid writing: etc....

It is also advisable not to use both abbreviations within the same sentence and to omit the comma after e.g. and the last comma in the list preceding etc. For example,

There are many types of dictionaries e.g. monolingual, bilingual, slang etc.

The example above is the thing best avoided.

Use e.g. with a comma when you are introducing a short list of examples

There are many good dictionaries on sale nowadays e.g., Chambers, Longman, and Collins.

Use etc. when it is obvious that you are referring to a long list

There are many types of dictionaries: monolingual, bilingual, slang, etc.

These are very common abbreviations derived from Latin and shouldn't create any difficulty of comprehension with the vast majority of English speakers. But if you are writing a formal report, paper, proposal, etc. or your audience might be unfamiliar with their meanings e.g., non-native speakers, then by all means use their English equivalents:

1. “such as”
2. “for instance”
3. “for example” can all substitute “e.g.” whereas 1. “and so forth” or 2. “and so on” can replace “etc.”.

It is considered poor style to use different abbreviations, such as: “ex”, “EX”, and to use more than one period after “etc.” So, avoid writing: “Blah, blah EX: blah, blah, blah, etc  ....”. (NO)

It is also advisable not to use both abbreviations within the same sentence and to omit the comma after e.g. and the last comma in the list preceding etc. For example,

There are many types of dictionaries e.g. monolingual, bilingual, slang etc.

The example above is the thing best avoided.

Use e.g. when you are introducing a short list of examples

• There are many good dictionaries on sale nowadays e.g., Chambers, Longman, and Collins.

Use etc. when it is obvious that you are referring to a long list

• There are many types of dictionaries: monolingual, bilingual, slang, etc.

These are very common abbreviations derived from Latin and shouldn't create any difficulty of comprehension. But if you are writing a formal exam, paper, letter, etc. Or your audience might be unfamiliar with their meanings e.g., non-native speakers, then by all means use their English equivalents “such as”, “for instance” and “for example” can substitute e.g. The expressions “and so forth” or “and so on” can replace etc.

Use e.g. with a comma when you are introducing a short list of examples

There are many good dictionaries on sale nowadays e.g., Chambers, Longman, and Collins.

Use etc. when it is obvious that you are referring to a long list

There are many types of dictionaries: monolingual, bilingual, slang, etc.

These are very common abbreviations derived from Latin and shouldn't create any difficulty of comprehension with the vast majority of English speakers. But if you are writing a formal report, paper, proposal, etc. Or your audience might be unfamiliar with their meanings e.g., non-native speakers, then by all means use their English equivalents “such as”, “for instance” and “for example” can substitute e.g. Either “and so forth” or “and so on” can replace etc..

It is considered poor style to use different abbreviations such as: ex, EX, and to use more than one period after etc. So, avoid writing: etc....

It is also advisable not to use both abbreviations within the same sentence and to omit the comma after e.g. and the last comma in the list preceding etc. For example,

There are many types of dictionaries e.g. monolingual, bilingual, slang etc.

The example above is the thing best avoided.