The following is summary of the chapter by chapter of Bodhisattva. The introduction was already pretty helpful for reading, and to narrow down to the crux of every chapter was as follows:
The excellence of Boddhichitta: An introduction to different types of people (who have sins, who might be already working out of compassion, etc.) how preaching this knowledge would bring pure joy.
Confession: Here, Shantideva confesses his own sins in form of anger, jealousy, ignorance - here he is completely taken down by the fear of lord of death - and confirms total dedication to the teachings of Buddha
Taking hold of Boddhichitta : He realizes the importance of compassion and thus dedicate his life for good of every living being on the world, and resigns from his own body dedicating it to good of anyone who would take it. He also then summon all who are wandering and trying to find the purpose of existence.
Carefulness: This chapter is like a warning to those who start preaching but then leave it mid way or do not pursue this with full dedication: it leads to reduction of welfare of everyone. Shantideva promises to act attentively as his life is fleeting and he believes human form to be the most precious which he is in living in now. Human form is believed to be the only form which will allow practice of virtue. Mere experience of pain does not let it go and more evil reoccurs with sufferings and thus Shantideva aims to remove these sufferings and clean his sins altogether. Then he talks about the power of his strongest enemies: anger, lust who have endured so long besides him and warns to not give any aid to these feelings, and warns about the injury/ pain fighting these pains will cause. Finally shantideva calls these feelings as pure mirages (but makes you aware about an indolent mind) and thus they have no place to live if once fought off.
Vigilant introspection: Finally shantideva starts talking about need of mindfulness to control our emotions and feelings to get rid of all our fears. He stresses on the need of eradication of distractions, ignorance and finding discipline. Ignorance and lack of introspection is like a leaking jar where even if you learn buddhist teachings you will not be able to retain or memorise anything. Then, Shantideva starts laying down the ways of introspection [except some of teachings of page 74 which were too much on discipline and difficult/ unacceptable in today's world] and the different sutras:
he asks to keep moving, be gentle, look at your faults but not be distracted, understand your needs and act accordingly
Keep verifying and inquiring how the body is being disposed
keep a watch on what and how the mind is engaging and strive to master concentration
in times of generosity, the mind should be relaxed
Fix target and chose to keep your mind simply on that - do not be distracted - and this will prevent growing any ignorance
Disengage from pointless conversations or gossips because they are simple delights and stay away
Think before you speak
When anger arises, stay like a log and do no speak
Similarly if you long for priase, criticise or spoil someone's name, use fight, want wealth, look for honors, overlook other's needs, feel attachment, be a log
"Take notes of your defilements and pointless efforts"
Calmly, with respect, courtesy, conscientiouseness, awe - work for others' happiness
If people quarrel childishly, let it be - don't be downcasted - treat them with love and understand them
Bear in mind we are selfless or an apparition
Mind and Body are two separate entities - so leave the attachment [page 70-71 are very beautiful in the book it is better to read them]
"Always strive to learn from everyone around" who come with the spirit of counselling
Praise and encourage people whose words and actions are worthy
"Take pleasure in excellence of others" and do not do anything which is not for others' sake - that will help in enlightenment
"Speak gently with moderation"
"In whatever actions you perform, you should not be dependent on others"
"Others' good should be supreme" and progress is important with growing
"Eat only what is needful"
Share the knowledge and learning with those who are defenseless and falling into the evil states
Do not harm your body in meaningless pursuits
Do not teach dharma to the people who are disrespectful and have decided not to listen (I interpreted "covering their heads" as not "ready to listen")
Implement all acts with pure diligence as per the teachings
Preach all these forms of introspection (act-watch your mind and body) with utter truth (implement and act on these teachings).
Patience: As the title suggests, this chapter is on cultivating the practice of patience, and the most important thing to overcome is Anger here.
Shantideva stresses that patience with utmost importance to habit - i.e. regular practice. He says that our self is inert and thus remains unaffected, even by anger which is only subjected to circumstances and experiences.
You cannot "become" something - you just ARE (existing) - so you will always be inert to any hatred or circumstances. This also means that when in sorrow, you would remain serene. There is nothing like resistance, for what will you oppose against and to whom?
He also talks about jealousy here : about the absurdity of someone to feel jealous when someone is happy - aren't we trying to find enlightenment for all - then how can we even get a feeling of displeased when someone is doing good in their own lives?
Praise and reputation are childish behaviors - because it leads to formation of the feelings of envy at the first place.
"my enemies should bring joy to me because they allow me to practice patience"
Again he stresses on the need of compassion and working for good of others
Diligence: Here shantideva stresses that practicing patience without being hindered by any desires is what can make someone a Buddha.
Meditative concentration: Leaving your body is the ultimate goal of mindfulness, and Shantideva here talks about the need to repel from lust.
Wisdom: There is a debate between a hypothetical reader and Shantideva here on the belief of this world as an illusion
Dedication: Here, Shantideva ends up devoting himself completely and asks for happiness and relieving pains for all