Which proces of liberation is easy in kali yuga?

'Yoga Meditation' is one and only process of liberation in not only Kali Yuga but all the Yugas. The only difference in Kali Yuga that it is much more difficult to learn Yoga Meditation during this period due to dearth of Gurus or enlightened masters who can impart the correct procedures of Yoga Meditation. You can learn the secrets in the Bhagvad Gita, where God himself imparts this knowledge, read and re-read very carefully and you may understand. Also please read the Path of Yoga by Prabhupada that is available at various ISCKON Centers and you will surely benefit from it.