Is it safe for a freshman girl to take her sister out for a trip?

After graduating from junior high school, I began to travel at least twice a year. My parents are very busy at work, and they all play personal advice by themselves. The safety factor of three people walking together is higher. You can sleep in a double room for accommodation. When you are old, it is not impossible to travel alone. Don't reveal a lot of cash as soon as you open your wallet. Small change is more useful. You can swipe your card for large purchases in unfamiliar cities, but don't let it go until late at night. It is very important to send text messages and report your trip to every place. It's far from a sparsely populated place. Don't talk to strangers while staying in an informal small hotel. Even if he/she is your hometown, don't disclose personal information easily, let alone tell him/her your next route. Don't eat the food and drink handed over. Bring your own cup, so as not to refuse others. As long as you have a basic awareness of safety precautions, don't be afraid of the whole journey for many years. The biggest trouble I encountered during my trip was missing the plane.