I have been a LEGAL immigrant to many countries. I am a Legal immigrant now.
You need a passport and money. You probably will need DNA testing, TB chest x-rays, fingerprints, and police background checks. Even banana republics require most of this stuff.
There is no Human right to immigrate. In the country I live now Africans try to play the race card and they don’t last long. BOOM Deported and Persona Non-Grata stamp.
If you overstay a VISA you are levied fines for each day and have to beg to be able to leave.