Welcome!
So here it is
XX-21+ - this rating is for 21 and over only. It is a stronger version of X-18+
XXX-35+ - Stronger version of XX-21+ and is for 35 ONLY
PG-13+ - Strong version of PG for films. Allows things like Vape Pens. Moonshine. And swears like f**k and assw*pe. And Mildly Moderate impact
G-8+ - 8 year olds and over film version of the G rating
R-16+ - 25% more appropriate version of R-18+
More soon!