One day before your flight, download the app of the airline you're flying so you can check-in and get your boarding pass. In addition to the airline app, I'll suggest to download the local transportation apps, whether it is for the local public transport or taxi, in different countries they sometimes use different companies (while Uber can be popular in one country Grab for example can be more popular in another.
"I'm not a fan of downloading a ton of apps, but it's worth it when you're flying. When you download an airline's app, you can check in from your phone, access your boarding pass (SO much easier than keeping track of a paper ticket), get flight updates, and, in some cases, stream in-flight movies and TV. "
Yeah, some are only 10kg!
There is no step 2.
Enjoy your flight.