Beginners
It is crucial imo, for beginners to place the focus on their practice on sensing the innate sense of presence, IAMness. That formless awareness that you can't pin down of which is vast, alive, luminous. It is the doubtless certainty of "what you've always been". Once identity shifts from the "seperate self" to awareness itself, practice flows smoother, more effortlessly; and this shift has a slight decrease in suffering, so that's always good :)
Please click to read stage 1 of ATR:
p.s I update these resources whenever I come across something suitable for said category.
Awakening to Reality - potential trappings
I decided to include this link because many mistaken the glimpse or realisation of formless awareness as Annata. This link is for people who have good contextual understanding of Buddhism but have not had IAM realisation yet. If you don't know what Annata is, don't worry about it!
Rupert Spira
Rupert Spira is deeply realised imo, but I'm guessing that he chooses to teach on the ground of infinite awareness/being (which I appreciate). Like Eckhart, his style is simple; Rupert is more direct and uses "non-dual" principles a lot (but beware later on, as awareness/God/Love as a ground of being is still dual!)
MCTB - Daniel Ingram
I was hesitant of including MCTB here. Oh! It stands for mastering the core teachings of the Buddha. MCTB is quite theoretical, but I think spiritual explorers somehow should familiarise themselves with territories. MCTB has harmed me more than helped me (purely due to personality). I know it's great for most people, it just really got the "attaining mode" out of me which didn't help!