Translation:When I surf the internet, I read many webpages.
Is the etymology of the new words that "ret" signifies "web", and "umas" is "to surf"? If "ret" is "web", does it also mean a literal spider's web, or just web in the Internet sense?
"reto" is a net or a network, such as a fisherman's net or a tennis net.
A spider's web is also a kind of "reto", but there's also the specific word "araneaĵo" for that (from "araneo", spider).
There's also "interreto" (or capitalised "Interreto") specifically for an internet (or the Internet) - an internetwork that connects other networks, and specifically the big internet over which the World Wide Web (Tut-Tera Teksaĵo, TTT), email, etc. run. ("teksi" is to weave, so the Esperanto name for the WWW is literally something like "the All-Earth Woven-thing", or "weavery" or "weave" or something like that.)
-um- is a suffix that doesn't have a fixed meaning.
On nouns, it's a bit like "thingy"; on verbs, it's a bit like "do stuff with".
In general, its meaning is a bit vague, but a number of words with -um- in them have received conventional meanings.
Thank you. I'm still at a stage where I'm having a tough time with some of these glued-together words, but comments like this put a "story" behind them, which makes it easier.
Cute. Esperanto thinks people still 'surf' the Web. I feel less old than I did earlier when I had to research the new meaning of salty...
Kio estas la diferenco inter retpaĝo kaj retejo? Ĉu ĝi estas la diferenco inter "web page" kaj "website," kiu estas malgranda ?
I'd say the difference is not small; it's like the difference between a letter and a word, or a word and a sentence, or a page and a book.
A website is made up of lots of web pages.
I'm reading this on a web page right now -- one of thousands of sentence discussion pages on the Duolingo website. (And there are thousands of other web pages in the website as well, e.g. all the lessons.)
Probably it is correct. If it is, you should report it in order to suggest your answer as valid.
I think that's a present progressive tense, that suggests a current/ongoing activity. "I am reading many webpages while I surf the internet"
The duolingo sentence is simple present active, which is something habitual or always-true. "Anytime I surf the internet I am reading webpages, because that is what 'surfing the internet' means"