When he was still a child, his mother, Anjani, had assured him that he would never be destroyed and when he feels hungry he can have fruits as red and ripe as the rising sun.Thinking that the glowing sun was a ripe red fruit he mistook it as an apple and tried to grab it, at the speed of wind, in the sky and the severe heat of the SUN had no effect on him.He was very mischievous in his childhood, once on the day of solar eclipse, Hanuman ran towards Rahu, and Rahu had to take help of Lord Indra.
One of his popular mischievous were that one day he saw Airavata ( Indra's white elephant) and tried to attack him. Seeing this attempt of the valorous monkey, Indra used his thunderbolt (vajrayudha) which hit the child's chin (hanu) and hurled him to the earth. (It is from this event that Anjani's monkey son came to be known as Hanuman.)
When Vayu, the Wind god, carried him off to Pataal in such a precarious condition, life on earth came to a standstill in the absence of air. Living beings felt breathless and were dying. All the gods went to Vayu and blessed the child.
Brahma blessed the monkey child with immortality, invulnerability, enduring devotion to God, and prowess (bravery). Agni blessed him, Saying, "Fire will never burn you." Kaal was no less generous, "May not death overcome you." Vayu blessed him with more speed than he himself had. Indra said, "No weapon of any kind shall wound you or hit your body." All the gods,blessed him saying that, "None will ever equal you in strength and speed." Surya gave him two siddhis of yoga namely "laghima" and "garima". With "laghima" he could attain the smallest form and with "garima" he could attain the biggest form of life.
Hanuman got educated by Surya, the sun god.
MEETING WITH SUGREEVA AND RAMA
Hanuman was a friend and servant of Monkey King Sugriva. On his request he came to get the identity of the two strangers who were wondering in their plains below the mountain, these strangers were Ram and Laxman. They were searching for kidnapped Sita. Hanuman placed them on his shoulders and took them to Sugriva on the mountain top.
Ram and Sugriva promised to help each other to find Sita.
When Rama and his brother Lakshmana were searching for Sita (Rama's kidnapped wife), they were advised to seek out the monkey king Sugriva. Hanuman was one of Sugriva's ministers, and when he first met the duo, he disguised himself as a brahmin.
After talking with them for a little while he could bear the deception no longer, and so he revealed his true form, fell and Rama's feet, and received Rama's blessing. From there, he led them to meet Sugriva.
CROSSING THE OCEAN, FINDING SITA AND BURNING LANKA
When Hanuman was searching for Sita he met Sampati who was brother of Jatayu. Jatayu was killed while he was trying to stop Sita from being kidnapped by Ravana. Sampati told Hanuman that he could see Sita being kept in Ashokvatika in Lanka.
All of Sugriva's monkey subjects began to search for Sita, and in this quest Hanuman leaped over the ocean to Lanka (again using his prodigious strength). On the way he encountered a snake deity Surasa, who demanded that he go in her mouth before she would let him pass by (she was actually disguised as a demoness to test Hanuman.
Hanuman made himself very large, and Surasa opened her mouth wider and wider to accommodate him. Hanuman then made himself very small, and dashed in and out of her open mouth. Surasa was pleased with his ingenuity and courage, blessed him, and allowed him to continue on his way.
After this a Rakshasi called Simhika caught hold of his shadow and started dragging him to her mouth so that she can eat him. Hanuman increased the size of his body inside her body and killed Simhika.
When Hanuman landed at Lanka and came to the gates of the city, he was met by Lankini, the city's guardian deity. She blocked his path into the city, and demanded to know who he was and what he was doing (fulfilling her role as a guardian).
Hanuman's answer was to strike a blow that knocked her over, after which he strode into the city. His ability to defeat the city's guardian deity foreshadowed that the city's ruler (Ravana) would soon lose power.
Rama searched the whole city for Sita, and finally found her in a grove of Ashoka trees. He reassured her that Rama would come to rescue her, and then set about testing the city defenses by making a ruckus.
When Hanuman Reached Lanka and met Ravana, Ravana did not offer Hanuman a chair to sit.
Hence Hanuman created his own thorn by extending his tail long enough and then sitting in front of Ravana.
Ravana was shocked to see this and called his demons to set Hanuman's tail on fire.When Hanuman went to Lanka Ravana's soldiers tied Hanuman's tail with rags fabrics and Hanuman made the tail longer and longer. The exhausted demons set fire to his tail.
Now it was Hanuman's turn he jumped all over Lanka setting the entire city ablaze with his tail still on fire.
He was eventually captured and brought before Ravana, who decided that Hanuman would be tortured by having his tail wrapped in oil-soaked cloth, and set on fire. Hanuman used his powers to make his tail enormously long (so that a lot of flammable material was tied to it). After the cloth was lit he slipped his bonds and jumped all through the city, setting it on fire, before jumping into the sea to make to the flame disappear. He then gave Rama the deatails about Sita and Lanka.
IN THE BATTLE OF RAMAYANA
Rama's brother Lakshmana had been mortally wounded in battle by Indrajita, and the only thing that could save him was the Sanjivini ("life-giving") plant, which grew far away on a mountain in the Himalayas. Rama was disconsolate at this news, and lamented his brother's approaching death, but Hanuman assured him that he would get the plant.
Hanuman flew to the Himalayas and found the mountain, but was unable to find the plant . Undaunted, he lifted the entire mountain and brought it back to Lanka, where the physicians quickly located the herb, and brought Lakshmana back to health. Cured, Lakshmana killed Indrajita.
In one of the battles, Hanuman knocked Ravana to the ground, snatched his crown, and escaped unscathed. Since (as in many cultures) the crown was one of the symbols of kingship, losing this foreshadows that Ravana's days in power are numbered.Ahiravana was a demon magician, who was called by Ravana (his friend) for help in the struggle against Rama's army. Ahiravana kidnapped Rama and Lakshmana by making them sleep magically, as he intended to offer them as human sacrifices to the Goddess Kalaratri.
Hanuman hid behind the deity's statue and told her to help him rescue Rama and Lakshmana. The goddess agreed and disappeared as Hanuman changed his form to that of the goddess' idol. When Ahiravana was about to sacrifice Rama and Lakshmana, Hanuman stopped him and ed him. Then he carried the princes back to their place.
HANUMAN'S OTHER PASTIMES
One day, during their exile, Draupadi ( the wife of the pandavas) asked Bhima( the strongest Pandava) to get her a flower of lotus. Bhima said, "Oh ! it's nothing. I will bring you in a second." On his way he found Hanuman sleeping on the road. Bhima did not recognize him and said, "O, you old man, move away from the road" Hanuman told him to move his tail off the road first and then he will move away. Bhima, the strongest of the Pandavas was not able to lift Hanuman's tail!
Then Hanuman regained his true form and blessed Bhima. After encountering several difficulties, Bhima brought the lotus flower to Draupadi.Hanuman, had a special place in the heart of Lord Rama.Hanuman's devotion to Rama was profound and everything and anything without Him seemed futile. Once, when Sita presented a pearl-necklace to him, he tried to find Rama in each pearl. But when disappointed he tore and threw it away.She was surprised and asked for an explanation. In reply, Hanuman tore off his chest with his nails and showed everyone the image of Rama and Sita engraved in his heart! Everyone was astonished and praised Hanuman.