In Duas Yastasheer , I always read that Allah(swt) Is the succorer of those who have a pure heart. So I often ask this in my duas
But what does that really mean?
Is it the fact to not have animosity ?

May I know some things to do to have pure heart? Or things to increase noor in our heart?

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To have a pure heart, follow the following advices:
1- Trust Allah, and believe that he will never let you down.
2- Be pious.
3- Do not hate any body, even if he harmed you.
4- Always look to the positive part of the things, not the negative part.
5- As you mentioned, keep your heart free of animosity, as it is a main factor for destroying the piety in the heart.
6- Do not misunderstand the people.
7- Free your self from ruthlessness.