can a sorcerer use quickened spell to cast .... let’s say lightning bolt .... as a bonus action and then use twined spell to cast 2 more lightning bolts ? 3 lightning bolts in a turn? Sounds crazy op ..... what ami doing wrong ? 

If you cast a spell as a bonus action, the rest of your spells that turn have to be cantrips with a casting time of 1 action. Also, Lightning Bolt can't be twinned because it targets more than one creature.

My phrasing was bad .... I meant like 3 targets being hit ..... two by the twinned spell and one by the quickened spell.....  

i took that clause as you couldn’t both quicken a spell and increase its range ..... 

but in my version wouldn’t the sorcerer spend two level 3 slots and strike 3 enemies with lightning on one turn or no ?

So how do you define hitting one target ? 

Quote from Brian_Avery >>

quicken just allows you to change the casting time from an action to a bonus action (usually so you can cast a spell as a bonus action and a cantrip on the same turn)

twinned just allows you to select another target for one spell you cast... so even if you could do them both in one turn (which you can't), the single quickened lightning bolt would select another target (the total would still be 2... not 3)

another reason this wouldn't work is lightning bolt is an AoE spell, not a single target spell (which is all that can be twinned)

to be crystal clear, a twinned spell allows a single spell (that's 1) to select another target (that's another 1) so the total is 2 targets (that's a total of 2)... not sure where you are getting the 3rd lightning bolt from in your example?

 

I’ll focus more on the Spirit of the question, rather than the literal. 

In 1 turn, you are allowed to quicken a lightning bolt (making it a bonus action), and then twin a firebolt (hitting two monsters with the firebolt cantrip).

This is similar to dishing out 3 spells in one turn, even though it is technically considered 2.

A quickened lightning bolt and a twinned lightning bolt  won’t work, however, for the reasons our friends pointed out above. 

so then it would only be possible to hit 3 targets in 1 turn with a cantrip? such as .... such as Fire Bolt? 

Quote from Cporter5 >>

so then it would only be possible to hit 3 targets in 1 turn with a cantrip? such as .... such as Fire Bolt? 

 

Yes! Exactly.

3 targets getting hit by a different firebolt in one turn!

Or, one target hit by 2 fire bolts and another target hit by the 3rd one. Set the world on fire. 

Lightning Bolt is an area of effect spell and not a single target spell.

Where is rule about casting multiple spells? I cannot find it on the website.

Its in the player's hand book where it talks about actions you can take.

Quote from lasombra81 >>

Where is rule about casting multiple spells? I cannot find it on the website.

Chapter 10: Spellcasting >> Casting a Spell >> Casting Time >> Bonus Action :

Bonus Action

A spell cast with a bonus action is especially swift. You must use a bonus action on your turn to cast the spell, provided that you haven't already taken a bonus action this turn. You can't cast another spell during the same turn, except for a cantrip with a casting time of 1 action.

Links: Basic Rules / Player's Handbook