You can stay abroad after studying abroad. When can I acquire foreign nationality?

Your question is rather general. First of all, after studying abroad, you may not be able to stay abroad smoothly, and staying abroad may not necessarily lead to immigration, but obtaining nationality is the last step.

For example, if you study in Canada for two years as a graduate student, you can get a two-year work visa. If you find a good job and have worked for two years, you can apply for employer-sponsored immigration. After successful immigration, you will be granted permanent residence status in Canada. Within six years of holding permanent residence status, you must have lived in Canada for four years and meet other conditions before you can apply for naturalization. Naturalization in Canada has certain considerations for English proficiency and integration into the local society.

The policies of other countries are different, depending on which country you study in. Of course, it is impossible for some non-immigrant countries to study abroad.