I'm wondering if there are any limits on saving through data persistence, and if you can create a loophole by saving it to different tabs that mean the same thing?
--this is just an example of what i mean, not to be taken seriously Save:(Player.."_1") Save:(Player.."_2") etc
Since Player names don't use underscores, you could loophole that to create more space to a player.
I also wanted to know how to see the saved stats in studio, so if Kenetic has 160 kills and BlueTaslem has 180 kill and I want to see that without joining them in a game.
Before I start my answer, I'd like to let you know that Data Persistence is outdated, and DataStores are used now. More on DataStores can be read on the wiki here.
Answer 1:
In short, yes, there are data limits.
Answer 2:
You can't view data from Data Persistence or DataStores in Studio. You can, however, create a GUI that displays the information. The reason you can't view data in Studio is because Data Persistence and DataStores are only accessible during a game, since they are functions that rely on an established connection to the ROBLOX servers.