In most countries, PR is not just a pathway to citizenship, it is practically the only pathway for people without ancestral or marital shortcuts. The standard architecture: hold PR, remain physically present for a further qualifying period, then naturalize. Citizenship adds what PR cannot give: a passport, a vote, unconditional security of status, and freedom from absence rules.
The additional requirements are fairly consistent across systems: physical presence tests counted in actual days, so travel logs matter; language proficiency, often at a higher certified level than PR required; civics or integration tests covering history and law; good character requirements including clean records and tax compliance; and sometimes an oath or ceremony. The question deserving earliest attention is dual citizenship, because some countries permit it and others force renunciation of your original nationality.
If citizenship is the goal, track presence days from the day PR is granted, keep language skills growing, and read the official naturalization criteria early, because they define the true finish line.