Avengers Infinity war ending explained

Hi guys i have got lot of query from my friends that what the hell happenned at climax of this movie #AvengersInfinityWar .So today i am going to explain this,as you all know that Thanos can finish half of universe after getting all infinity stones and he does exactly the same.At last he snaps his finger and half universe start vanishing.
But there is a scene in movie where dr. Strange said whatever happens he will no give time stone to thanos,but you may forget the scene of Dr.strange on titan planet
That he went in future to see the possible outcomes and he sees approx 1cr 40lac and six hundred outcomes on which there is only one outcome to win against the #Thanos ,and he actually done the thing by giving time stone because this may be the reason to win against thanos.
And from comics we know that #Iron man will create a project Arsenal that will help to defeat thanos .
And keep calm that some of superheroes has been died,according to directors somehow they will be again alive in #Avengers4 .
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Thanks for reading.