You gain 1 stat point for every ‘base’ (i.e. Character) level (so you would have 280 points to spend at the current max level of 280).
You also gain 1 bonus stat point that you can freely distribute for every Goddess Zemyna statue your worship.
Every few points you put into a stat will also give you “bonus” points into that stat, giving bonus stat points sooner based on the amount of points you already have in that stat:
You will also gain +10% per Class Rank (currently there are 7 Ranks, so you will gain +70% at max Rank) into both INT and STR.
The number of points spent does not increase like in Ragnarok, it is always just 1 point gives (at least) +1 to that stat (sometimes 1 point gives more than +1 to that stat, as outlined above).