Yes, you can. In RDR2, even after you've completed the main story, there are still a lot of side missions available for you to do. It's a great way to keep exploring the game world and getting more out of the game.
Yes. Red Dead Redemption 2 is designed in such a way that side missions remain accessible post - main story. This is great for players who want to fully immerse themselves in the game's rich world. You can still engage with the diverse characters and their stories that were perhaps overlooked during the main story run. For example, you might come across a stranded traveler who has a unique side mission for you. There are also side missions related to the game's factions that can be explored long after the main story has concluded.
Sure. The side missions in Red Dead Redemption 2 don't disappear once you finish the main story. There are various types of side missions, like helping out strangers, hunting down bounties, and participating in certain events in different towns. Completing these side missions can also give you additional rewards such as money, unique items, and new horse breeds. So it's well worth going back to do them even after the main plot is over.