Apart from meeting up with locals in a travel destination, online conversation is also very helpful.
You can ask them about local attractions, transportation, restaurants, and more. Your travel will be easier and more enjoyable.
If you are someone who is deeply acquainted with your time, one person is enough. But if possible, make friends with 2 or 3 local friends in advance.
They might not be able to respond to you in real time, so if you have any questions, it's better if you ask in advance.
It is also good to check with your local friends to see if they can help at the time you need some help when travelling.