Apostille can be done for personal documents like birth, death, marriage certificates, Power of Attorney, Affidavits etc. and educational documents like degree, diploma, matriculation and secondary level certificates etc.
If you are planning to apply for a family visa abroad, then attestation of your marriage certificate is mandatory. You must know that without an attested marriage certificate you can't get a family visa.
Attestation is the process to certify the authenticity of the certificates from its concerned department for the purpose of employment or higher education in abroad.
PCC is a document issued by the Consulate/High Commission, certifying that the applicant has never been involved with the Police. It is required when a person applies for emigration status to countries.