How many countries can I visit without a visa? Wrong question. But let me answer it anyway: it depends entirely on your passport.
There is no universal number. The strongest passports open around 180 destinations without a prior visa. Passports at the other end open far fewer. Same planet, wildly different maps. Your nationality is the single biggest factor in how much of the world you can see on short notice, and it is not close.
It also depends on what you count. Visa-free and visa on arrival both skip the embassy visit, but they feel very different at the airport. E-visas skip the embassy too, and some indexes count them while others do not. So when someone quotes you a number, ask what they included. Half the arguments about passport rankings are just people counting different things.
Rankings also hide how lopsided the world is. A passport that opens all of Southeast Asia and most of Africa can score the same as one that opens Europe and North America. Same number, completely different vacations. Raw counts are a rough guide, not a travel plan.
A few things that do not change your number: a green card, which is US residence and not a travel document, since visa rules follow your passport. Frequent flyer status. Confidence. All useful. None of them stamp.
So stop asking about anyone. Ask about yourself. Find a can I travel without a visa checker that works for your passport specifically, or a visa free country lookup tool by passport that lists your real number with the stay limits attached. A visa eligibility checker app for iOS and Android does this from your pocket, no forum spelunking required. That number is the only one that will ever apply to you.
The visadocs.fyi power ranking covers 120+ passports against 50 top destinations, so you can see exactly where you stand. The instant eligibility report gives you the per-destination answer: where you can go, how, and for how long.