According to the Gita, how do I abandon fruits of my karma? Should I donate my whole salary and stay hungry?

You can as well stay hungry without earning! Why waste your time and energy in toiling from dawn to dusk just to earn money, donate all of them and stay hungry?

O Arjuna! Yoga is not for him who eats too much or doesn't eat all; Yoga is not for him who sleeps too much or doesn't sleep at all

yukta-svapnāvabodhasya yogo bhavati duḥkha-hā।। 6.17

—— indirects on kuorans, irl and idols

Is there any need of sweating so much just to stay hungry? And after so much toiling from morning till evening or night, where's the energy left in you to stay hungry even? You will not only be able not to stay hungry, but you will overeat! To stay hungry, your body must in a fit condition.

nātyaśhnatastu yogo ’sti na chaikāntam anaśhnataḥ।

There must be a sense of balance in all your activities avoiding the two extremes of being a workaholic and being a lazy person. Similarly in your eating, sleeping, relaxing, you must be moderate.

What are the basic human needs according to psychology? What are the consequences of not meeting these needs?

A person who is moderate in food, recreation, work, sleep and waking, to such a person Yoga becomes a means to kill sorrow!

Says Sri Krishna in the 6th Chapter of the Bhagavad Gita —

युक्ताहारविहारस्य युक्तचेष्टस्य कर्मसु |

A kid threw a stone at my car. I confronted his mom (who was nearby). She said, "You can't prove it was my son." How should I have reacted?

युक्तस्वप्नावबोधस्य योगो भवति दु:खहा || 6. 17||

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So that way, you cannot abandon the fruits of your action. Now you will be attached to the action of donating all your money and staying hungry!

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If you want to donate your whole salary and stay hungry, why work at all in the first place?

Abandoning the fruits of actions means you offer the results of your actions to God. This doesn't mean that you will not receive the fruits of your actions. You certainly will! But when you work, you must perform it as an offering unto God and leave the results in His hands. You don't think about the results of your actions while you are working, and even after you are done with your work!

na chāti-svapna-śhīlasya jāgrato naiva chārjuna।। 6.16।।

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न चाति स्वप्नशीलस्य जाग्रतो नैव चार्जुन || 6. 16||

yuktāhāra-vihārasya yukta-cheṣhṭasya karmasu।

Nirvritananda

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Thanks for your question and asking me to answer!

नात्यश्नतस्तु योगोऽस्ति न चैकान्तमनश्नत: |

When you receive your salary at the month end, use ⅒ of it for Dharmic activities and the with the remaining amount, use it to keep your body in a fit condition for your sadhana and, to support your parents and other family members like your wife and children (if any).

Can you tell me something about yourself?