One option is to look on Crunchyroll. They often have a wide range of manga, including 86. Sometimes you might need to have a subscription to access the full content.
Well, there are several places. Some people find it on dedicated manga apps such as MangaPlus. Another possibility is to search on forums where fans might share links to legal or unofficial sources. Just make sure to stick to legal ways to enjoy the manga.
Well, you might find JoJo manga on platforms like Viz Media or Shonen Jump. Sometimes, your local library might have physical or digital copies too. Another option could be to look for it on specific manga apps that offer a variety of titles.