If you want to study in Europe without paying tuition, the first thing to know is that the rules are not the same in every country. In some places, public universities charge no tuition for many students, but you may still pay semester fees or living costs. In other places, free or low-cost study is only for students from the EU or EEA, or for people who meet specific residence rules.
The safe approach is simple: check the university's admissions page, the national education authority, and the immigration authority for the country you want. That is where you will see the current rules for tuition, language, visa, and proof of funds.
What
Rules, fees and deadlines change. Check the university's own admissions page and the official immigration site of the country before you act on anything here.