save and load array variable in savegame-- need help-- unreal engine4

i need to save last level name, total coins, all prize data etc. Is i have to crate different different slot and create all in begin play or can i use only one save slot for store int, array, string variable data. Or i have to use begin play of my player or game mode or game instance. the one problem is also that if i install game in phone and run it. if i leave the game then all data lost and game begin from level1 and coin set to default. and all open balls prize lost.