Ask your friends, relatives ... People you know.
That is the ONLY "good way" to find a travel partner. Going with someone you don't know, is a good way to get robbed (or worse).
I am looking for a travel partner. What are good ways to find one? Online/offline
I think you have to ask your friends, relative or family who knows you very well. This is the only good and best way to search a travel partner. I will suggest you that don't travel with unknown person.