For residents of Japan, ticket for Tokyo Olympic Games will be sold from the spring of 2019 and one for Tokyo Paralympic Games from the summer. If you want to get the tickets, you definitely should gather information on how to get the tickets and prepare for the sale. The ID registration for buying the tickets is already open. By registering the ID, you can get official information about the ticket.
However, there seems to be the ID registration webpage only written in Japanese… I can’t find English one. Additionally, I’m not sure how those who don’t live in Japan can get the tickets. We need more information for non-Japanese speakers.