There are lots of things to learn about Lakshmi devi.I will try to add any new slokas , mantra for Lakshmi when ever i get contributions.Its important that we must learn something about Lakshmi devi.
Lakshmi : Hindu Goddess of wealth , fortune , love and beauty :
Lakshmi or Mahalaxmi ( Mahalakshmi ) is the Hindu Goddess of wealth, fortune, love and beauty, the lotus flower and fertility. Representations of Lakshmi (or Shri) are found in Jain and Buddhist monuments, in addition to Hindu temples. Generally thought of as the personification of material fortune and prosperity, she is somewhat analogous to the Greco-Roman Aphrodite or Venus, as she also represents eroticism and is similarly thought to have originally "borne of the sea" in her most famous myth, as did those love goddesses.
Various Avatar of Lakshmi - Consort on Vishnu :
She is the consort of Vishnu and married his incarnations Rama (in her incarnation as Sita), Krishna (as Rukmini) and Venkateshwara (as Alamelu). In addition to Rukmini, however, she was also thought to have incarnated as the milkmaid Radha, Krishna's youthful lover prior to his marriage to Rukmini. In Vaishnava traditions, She is believed to be the Mother Goddess and the Shakti of Narayan.
Goddess Laksmi is the deity of wealth, affluence an ruling power. In astrology Venus represents Lakshmi, Durga, Santoshi Ma and Shiva-Parvati. Venus rules over Taurus and Libra signs. Venus in odd signs represents Lord Shiva. Venus in even signs represents Lakshmi, Annapurna Parvati, Vaishnavi Durga, Santoshi Ma etc. When Venus owns Lagna, 5th, 9th and 10th house and when Venus occupies Lagna, 5th, 9th, 10th and 12th house worship of Laxmi may give immense prosperity.
Legends : Story of Lakshmi's appearance :
The appearance of goddess Lakshmi is related to an ancient story. Durvasa the short-tempered sage once presented Indra, the king of the gods (devas) with a garland of flowers which would never wilt. Indra gave this garland to his elephant Airavata. Sage Durvasa saw the elephant trampling the divine garland and cursed Indra, for he had shown disrespect to the sage. The sage cursed Indra that he and all the gods would lose their power because it had made them so proud and vain. Due to the curse, the demons vanquished the gods out of the heavens.
The defeated gods then went to seek refuge to the Creator Lord Brahma who asked them to churn the ocean of milk, Ksheersagar, to obtain the nectar of immortality. The gods then went to Lord Vishnu, to seek his assistance. Lord Vishnu took the Avatar Kurma (Tortoise) and supported the Manthara Parvata (mountain) as a churning rod, while the king of the serpents, Vasuki, became the churning rope. The gods and the demons (under the leadership of the pious and wise King Bali Chakravarti) both helped each other in churning the ocean of milk.
Amongst the host of divine gifts which appeared from the ocean, goddess Lakshmi appeared and then chose Shri Vishnu as her consort, as only He had the power to control Maya (illusion). Because of this, Lakshmi is also called the daughter of the sea; since the moon also appeared from the ocean during the churning, the moon is called her brother. Alakshmi, the goddess of misfortune, is Lakshmi's older sister. She is said to have also arisen from the sea of milk.
Lakshmi in Vishnu purana :
According to the Vishnu Purana, Lakshmi is the daughter of Bhrigu and Khyaati and resided in Swarga but due to the curse of Durvasa, she left Swarga and made Ksheersagara her home. The reappearance of Lakshmi after Samudra manthan and her marriage to Vishnu thereafter, remain the same. Laxmi is the power and Maya of Lord Vishnu. In some places She is seen in two forms, Bhudevi and Sridevi, both either side of Vishnu. Bhudevi is the fertility form in which She is Mother Earth. Sridevi is the wealth and knowledge of Her which is seen with Narayan. Most people are mistaken that they are separate beings although they are one, Laxmi.
Names of Lakshmi :
Lakshmi has many names. She is known to be very closely associated with the Lotus, and her many epithets are connected to the flower, such as:
Padma: lotus dweller.
Kamala: lotus dweller.
Padmapriya: One who likes lotuses
Padmamaladhara devi: One who wears a garland of lotuses
Padmamukhi: One whose face is as beautiful as a lotus
Padmakshi: One whose eyes are as beautiful as a lotus
Padmahasta: One who holds a lotus
Padmasundari: One who is as beautiful as a lotus
Other names of Goddess Lakshmi :
Bhargavi: One who is the incarnation of the daughter of Sage Bhrigu
Sridevi: Goddess of wealth
Chanchala: One who is fickle and does not stay at one place
Bhumi Devi: Earth goddess
Indira: Beautiful goddess
Rama devi/Vaishnavi: Wife of Vishnu
Jalaja: Born from sea.
Aiswarya: Wealthy.
Roma: Wife of lord Hari
Appearance of Goddess Lakshmi :
Physically, goddess Lakshmi is described as a fair lady, with four arms, seated on a lotus, dressed in fine garments and precious jewels. Her expression is always calm and loving. The most striking feature of the iconography of Lakshmi is her persistent association with the lotus. The meaning of the lotus in relation to Shri-Lakshmi refers to purity and spiritual power. Rooted in the mud but blossoming above the water, completely uncontaminated by the mud, the lotus represents spiritual perfection and authority. Furthermore, the lotus seat is a common motif in Hindu iconography.
Vehicle of Goddess Lakshmi :
Goddess Lakshmi's traditionally accepted vehicle, the owl (Ulooka in Sanskrit), is a bird that sleeps through the day and prowls through the night.
Time for Celebration and worshipping Lakshmi by Hindu's :
Hindus worship Lakshmi the most on Diwali, the festival of lights. According to tradition people would put small oil lamps outside their homes on Diwali and hope Lakshmi will come to bless them.
The prefix Sri (also spelled as Shri, pronounced as shree) renders as 'one who takes delight in Sri' Lakshmi, meaning wealth, wealth of any kind. Primarily eight kinds of wealth are established, associated with goddess Lakshmi. They are:
1) Adi Lakshmi [The main goddess]
2) Dhanya Lakshmi [Granary wealth]
3) Dhairya Lakshmi [Wealth of courage]
4) Gaja Lakshmi [Elephants, symbols of wealth]
5) Santana Lakshmi [Wealth of progeny]
6) Vijaya Lakshmi [Wealth of victory]
7) Vidya Lakshmi [Wealth of knowledge]
8) Dhana Lakshmi [Monetary wealth]
Any thing that need be affluent gets the auspicious prefix or suffix 'Lakshmi', or 'Sri' like Rajya Lakshmi (Wealth of Empire), Shanti Sri (Wealth of Peace), etc. In modern India, common titles standing in for the English Mr. and Mrs. are Shri (also Sri or Shree) and Shrimati (also Srimati or Shreemati), as in "Sri Gupta" or "Srimati Mangeshkar".
Goddess Lakshmi is worshipped by those who wish to acquire or to preserve wealth. It is believed that Lakshmi (wealth) goes only to those houses which are clean and where the people are hardworking. She does not visit the places which are unclean/dirty or where the people are lazy.
In Uttarakhand, after the worship of the goddess on Diwali night, the Shankh or Conch is not blown. This is because the shank is also from the ocean like the goddess herself, so it is given a day of rest.
Laxmi is the patron goddess of Kolhapur city, Maharashtra.
Prayers for worshipping Goddess Lakshmi :
Two of the most famous prayers for worshipping Ma Lakshmi are: Sri Lakshmi Stuti By Indra and Sri Sukta. There is another famous prayer pronounced by the great sage Agasti: Agasti Lakshmi Strota