People used to to buy all of these expensive guidebooks when they were planning to travel. There’s no need to do that anymore. Just look up all of your questions online.
If you are going to be in a country for more than ten days, you may want to get into getting a SIM card.. This is something you put into your phone so you can make calls. I know you will be able to buy these in the airport. You may also want to look into international plans for your phone to figure out which is the least expensive way to go.
Live in the moment when you are traveling. You want to make the most of your time while you are wherever you are. You don’t want to waste your trip thinking about your past or your future.
It is always good to check on whether you can drink the water in the country you are visiting. Often you will find that it is not. Don’t worry, you will find bottled water pretty much anywhere you want to go.