Magic the Gathering, Chandras spitfire rule?

Ok, one spells are not cast simultaneously Say you have Chandra'ss spitfire, which get +3/+0 whenever anopponentt is dealt non combat damage (meaning that is dealt from a spell or a creature ability not from attacking) Now so you have CS on the field, you play 1 Lightning Bolt for 3 damage it goes onto the stack before it resloves, you then play another right after, the second Lightning Bolt goes on the stack above it. The second Lightning Bolt will hit first, giving CS +3/+0 due to your apponent recieving non-combat damage, then the first Lightning Bolt will resolve giving CS another +3/+0 making her a 7/3 UEOT.

P.S another great combo with her is Swing Double Lightning Bolt (or any other instant damage spells you can use) our apponent then takes 13 damage then you use Fling on CS for another 7 damage and that is GG xD. Thats the bases offone of my Mono Red Burn decks its Almost a Turn 4 Guarantee WIN

I hoped that helped^^

Twice.

Firstly, no two spells or abilities can ever resolve simultaneously, even if they are both on the Stack at the same time.

Secondly, Spitfire's ability triggers every time an opponent is dealt any non-combat damage.

Spells are unable to resolve at the same time because of the stack. Last In, First Out. A shock, or whatever, will go on top of the first shock and the second will resolve first.