They are:

By being kind and charitable

According to Ady Ibn Hatim (may Allah be pleased with him), the Prophet (peace be upon him) said:

"Guard yourself from the Hellfire even with half of a date in charity. If he cannot find it, then with a kind word."

[Sahih Bukhari 1417 and Sahih Muslim 1016]

By fasting

To put as much space between yourself and hell, make sure you fast on Mondays and Thursdays outside Ramadan, the three white days (13th, 14th and 15th of every Islamic month). It wouldn't hurt to use the voluntary fasting days.

The Prophet (peace be upon him) said :

"Whoever fasts a day in the way of Allah, then Allah will move his face away from the Hellfire by a distance of seventy years."

[Sahih Bukhari and Sahih Muslim]

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Combining fasting and prayer

Abu Huraira (may Allah have mercy upon him) reported: The Prophet (peace be upon him) said:

"Whoever believes in Allah and His Messenger, establishes prayer, and fasts the month of Ramadan will have a right upon Allah that he will be entered into Paradise whether he strives in the cause of Allah or remains in the land in which he was born."

[Sahih Bukhari 2790]

By 'weeping for the fear of Allah'

Abu Hurayrah (may Allah be pleased with him) said: The Messenger of Allah (peace be upon him) said:

"A man who weeps for fear of Allah will not enter Hell until the milk goes back into the udder, and dust produced (when fighting) for the sake of Allah and the smoke of Hell will never coexist."

[Jami' at-Tirmidhi 1633]

By being on your best behavior

The Prophet (peace be upon him) said:

"Shall I not tell you for whom the Hellfire is forbidden? It is every person accessible, polite, and mild."

[Sunan At-Tirmidhi 2488, Hasan]