What are the conditions for entering the Highest Paradise and the deeds that lead to it?

Entry into the Gardens of Paradise (Jannat al-Firdaws) is conditioned upon faith (iman) and righteous deeds. Among the righteous deeds that lead to it are: worshipping Allah and not associating partners with Him, establishing prayer (salat), paying zakat, fasting Ramadan, and performing Hajj to the House. Among the gates of good are: fasting, charity that extinguishes sin, and a man's prayer in the depths of the night. The head of the matter is Islam, its pillar is prayer, and the peak of its hump is jihad. The key to all of that is safeguarding the tongue.