What's the entry card for?

For example, the immigration card: what level does this thing depend on? The most elementary card is a national visa, just a pass; A little higher, that is, the right of abode, you can live in China, but you don't enjoy welfare benefits; The next level is the right of permanent residence, which is equivalent to the local permanent residents, enjoying the treatment of local people (different in some countries), and being elected without political elections; The highest is the passport. After you get the passport of that country, you become a citizen. Which country do you want to go to?