You poop first in the toilet and if it was a messy one you use some paper (not all countries’ pipes can handle paper though). Then you go to the bidet and clean there. Let the jet hit your hole and wiggle a bit if need be. Use some paper to dry off. Woman will also wash their privates with the bidet after peeing.
In India and China you also got a hose or just a hose in many places. That requires a bit more finesse due to the risk of giving yourself a shower if you don’t aim well. You might even just get a cup which you fill and use to wash yourself manually. You need to carry some liquid soap and sanitizer when traveling in areas that might require this and keep your fingernails cut short. In remote areas it is a hole next to the animal pen and you bring your own paper.
I got a bidet attachment for my home during the pandemic due to the severe toilet paper hoarding that was going on.