Regarding the use of the adverbs and difference between them.

My question is regarding the usage of the adverbs "et al" and "etc." and their meanings.

I have recently noticed that I have "perhaps" used the adverbs like "et al" often at wrong places. That is so because by the meaning of the adverb "et al" I used to think "and others". E.g. "it includes WSJ, Times, Economist et al". I was half sure about its usage there. I thought the adverb "etc." can also come there, but I went by the adverb "et al"; thinking that "and others" would be more appropriate. My confusion regarding them increased when I decided to see the "thorough" meaning of the adverb "et al" . From what I have inferred , not sure correctly, is that the adverb "et al" is used mostly with name nouns like Smith, John etc. E.g. "Snoopy, Charlie Brown et al get a new owner"

So, now please explain three things to me. What is the difference between the adverbs "etc." and "et al"? Where should they(et al, etc.) be used? And where can they be used? Thirdly, did I correctly used the adverb "et al" in my e.g.?

PS: Sorry for a bit long-winded post. I wanted to explain my case clearly to get a good explanation . I can't speak succinctly as I don't command over the language.

Regards and thanks for reading and answering.