Im quite confuse about Seasonal, Live, PTR .
can someone explain to me? lol . . .
I am also relatively new to post-AH D3.
Let me share what little I know. Perhaps the true vets will correct any inaccuracies.
Seasonal is the most up-to-date game. New items/gameplay etc. that were announced for the game are included for Seasonal characters.
It is basically an enticement for players to "start from scratch" & play the game again to benefit from the new additions to the game.
There are Leaderboards for those looking to claim the "best D3 player" tag etc.
After the season ends, all Seasonal characters can be continued as non-Seasonal ones. All your items & levels are saved, transferred to your "normal" game.
PTR is the beta-testing of the next version of the game. This could be for a new major patch or a new Season. Players who decide to be involved in PTR get a sneak peak of the next version of the game. Characters from PTR cannot be carried over.
I don't know what "Live" is. Could it be referring to the non-Seasonal characters?