Reddit mentions of The Nectar of Manjushri's Speech: A Detailed Commentary on Shantideva's Way of the Bodhisattva

I'd wholeheartly recommend The Words of My Perfect Teacher and The Nectar of Manjushri's Speech.

Any commentary is meant to be a support for study with a living teacher. One of the reasons for this is that the limited views and misconceptions we have when encountering the commentary will tend to continue, and condition our notion of what the commentary is saying, unless the points are made clear and our unconscious errors are pointed out by the teacher.

The best commentary is one that can be elucidated and indeed embodied by a living teacher in face-to-face study.

There are many commentaries on Bodhisattvacharyavatara in English.

The Nectar of Manjushri's Speech is a more formal, point by point treatment by the disciple of the famous Patrul Rinpoche, Kunzang Pelden.

For a more accessible and anecdotal offering, try Pemo Chodron's No Time To Lose.

Kelsang Gyatso's article on the Bodhisattvacharyavatara was published in TriCycle magazine.

Here are some audio lectures that go verse by verse, by Thubten Chodron.

And there's Introduction to the Oral Commentary on Shantideva's Bodhisattvacaryavatara by Dzogchen master Khenpo Choga Rinpoche.

About generating Bodhicitta:

The basics of generating Bodhicitta, in the Gelug tradition, are tackled in How To Generate Bodhicitta by Ribur Rinpoche.

The great Dudjom Rinpoche offers in Essential Advice for Solitary Meditation Practice a very pure guide to practice. This text forms a chapter in Wisdom Nectar, which contains many teachings on practice in the Nyingma/Dzogchen/Dudjom lineage.