Here’s a list of standard ports you should see at least once. You shouldn’t remember them, but you should be able to differentiate between an Important (HTTPS – port 443) and a database port (PostgreSQL – port 5432)
Important ports:
FTP: 21
SSH: 22
SFTP: 22 (same as SSH)
HTTP: 80
HTTPS: 443
vs RDS Databases ports:
PostgreSQL: 5432
MySQL: 3306
Oracle RDS: 1521
MSSQL Server: 1433
MariaDB: 3306 (same as MySQL)
Aurora: 5432 (if PostgreSQL compatible) or 3306 (if MySQL compatible)