Yep, it's still a thing! And if you haven't played in a while, holy crap, things have changed. You won't be catching Rattata endlessly anymore - the Pokemon available now rotate with each season, and there are plenty of events that keep things fresh. You can beat up Team Rocket grunts, and sometimes Giovanni. Raids now include Ultra Beasts and Mega Evolutions - and Niantic's changed up the system so you can use Mega Evolutions way more often. And you can transfer Pokemon into Pokemon Home for use in other games.
You can go as crazy complex as you'd like, but here's a few good resources:Leek Duck
will keep you update on events, what Pokemon are awarded from research, current Ditto disguises, and more. He's also got a Twitter account
where he puts handy graphics on current things, but who knows how long Twitter will remain usable.The Pokemon Go Gamepress site
is a good place for news and analysis, especially if you want to dive into individual Pokemon to see how they stack up in PvE and PvP. (Thanks to the limited move pool, some Pokemon that are great in the main games aren't as good here, but by the same token some Pokemon are much better here.)Silph Road
is another great site for deep dives, including shiny rates, a nest atlas, raid strategies, and more.
Poke Genie is probably the best free companion app for Pokemon Go out there. Not only is it great for remote raiding (it keeps things fair whether there are tons of raiders in the queue or loads of open lobbies), plus it has an intuitive type effectiveness chart to help you make sense of the rock paper scissors lizard Spock
That's enough of my yammering. Go out there and huck balls at monsters!