How to travel to over 100 countries on a modest salary?

I make a decent amount of money, but not enough to afford first-class tickets or luxury accommodations. I live in Europe, but I’m interested in exploring more destinations in South America, Asia, Africa, and Oceania. <br><br>What’s the best way to make the most of my budget and visit a significant number of countries without breaking the bank? Should I look into budget airlines, hostels, or something else entirely?<br><br>Any advice would be greatly appreciated!