List all 10 Gurus of Sikhism and write their main achievements and important things they have done for Sikhism.
1. Guru Nanak Dev Ji (1469-1539): Founder of Sikhism, preached the importance of unity, equality, and selfless service, composed bani (holy hymns) and emphasized the importance of meditation and connection with God.
2. Guru Angad Dev Ji (1504-1552): Developed and promoted the Gurmukhi script, introduced communal kitchens (langar), and structured Sikhism as a separate religion with distinct doctrines and practices.
3. Guru Amar Das Ji (1479-1574): Established the institution of 22 manjis (administrative units) in the Sikh community, promoted gender equality and challenged caste-based discrimination, compiled the Anand Sahib and organized the first two Sarbat Khalsa (Sikh council meetings).
4. Guru Ram Das Ji (1534-1581): Founded the city of Amritsar, constructed the Harmandir Sahib (Golden Temple), introduced the institution of the Guru ka Langar, and composed several bani including the Lavan hymns.
5. Guru Arjan Dev Ji (1563-1606): Compiled the Adi Granth (the Sikh holy scripture), completed the construction of the Harmandir Sahib, established the institution of Masands (Sikh representatives) and actively challenged the Mughal Empire's persecution of Sikhs.
6. Guru Hargobind Sahib Ji (1595-1644): Built the Akal Takht (the highest Sikh temporal seat of authority), established the concept of Miri-Piri (temporal and spiritual authorities), and led the Sikh community in defending itself against the Mughal Empire.
7. Guru Har Rai Ji (1630-1661): Emphasized the importance of compassion, introduced medicinal herbs and cures, and strengthened the military capabilities of the Sikh community.
8. Guru Harkrishan Sahib Ji (1656-1664): Became the youngest Guru at the age of five, manifested spiritual and healing powers, and comforted the sick and afflicted with charity and love.
9. Guru Tegh Bahadur Ji (1621-1675): Sacrificed his life to defend the religious freedom of the Hindu Brahmins, composed the bani Saakhi Pothi and contributed hymns to the Guru Granth Sahib.
10. Guru Gobind Singh Ji (1666-1708): Created the Khalsa Panth (a community of the pure), introduced the five K's (symbols of Sikh identity), and fought against tyranny and oppression. He also compiled the Dasam Granth and completed the Guru Granth Sahib, the holy scripture of Sikhism.