I've been reading some answers about when to use 'as of' and 'from', but I still have doubts about when to use each one. e.g.:
You can check-in from 3pm
You can check in as of 3pm
For me (My native language is Portuguese) the first option sounds more natural but I'm not sure if both are correct.
And in this case:
From now and onward the prices will increase a lot.
As of and onward the prices will increase a lot.