Weekend Update/What Happened This wWeekend

I honestly don't know how to describe these suggestions, but they sound more natural in English. Your original title was grammatically fine, of course. "This Weekend."

This weekend came, a cold front came that brought temperatures down and brought cold weathercold weather and low temperatures to the south and southeast regions of Brazil.

Don't repeat the verb.

I believe that this will help to reduce the number of people who would needlessly be exposed in the streets and markets so that they no longer haveplaces, decreasing cases of the coronavirus.

On the weekends, at night you can hear the noise of motorbikes from pizza and hamburger deliverers who are making deliveriedropping off orders in the neighborhood.

It's bad style in English to repeat verbs or similar words in the same sentence. So I changed "making deliveries." But "making deliveries" was grammatically correct.

People just want to stay home induring the cold weather, watching nNetflix and eating pizza for example.

"For example" was fine, but something told me to remove it.

Yesterday, I bought a used notebook.

It will be good because it is not everythingthere are some things that you can't do with a tablet.

Today debuts, the third and final season of 'Dark,' a German Netflix series, debuts.

I read this week that 'Dark' is already considered the best Netflix series ever produced.

I went back totried watching the series from where I left off at the beginning of the second season, but as I stayedhad gone a long time without watching, I don't remember many characters very well.

Good sentence. This sounds very natural, very native.

I think I should watch the first season again to remember certain events and also some charactercharacters and events.

"Characters and events" sounds much better than "events and characters." There's something about the sounds.

This weekend came, a cold front that brought temperatures down came and brought cold weather to the south and southeast regions of Brazil.

It's the cold front which came to Brazil and brought cold weather, not the weekend.

I believe that this will help to reduce the number of people who would needlessly be exposed in the streets and markets so that they no longer have cases ofcan avoid catching the coronavirus.

Personally, I find that "...have cases of coronavirus" sounds a little official, and therefore is a little awkward to use for small groups or individual people. I associate it more with a large group, such as organisation or a country.

For example,
"Brazil no longer has cases of coronavirus."

(Other correctors, feel free to chime in and correct me if I'm wrong)

On weekends at night you can hear the noise of motorbikes from pizza and hamburger deliverers who are making deliveries in the neighborhood.

Alternatively:

On weekends you can hear motorbikes from pizza and hamburger deliveries in the neighbourhood.

People just want to stay home induring the cold weather, watching nNetflix and eating pizza for example.

It will be good because it is not everything you can do with a tablet.

This sentence is technically correct but it's meaning is a little unclear. Do you like it because its functions are more limited than a tablet's, so you can focus more?

I went back to watching the series from where I left off at the beginning of the second season, but as I stayed a long time without watchinghaven't watched it in a long time, I don't remember many characters very well.