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I would strongly recommend

Heartwood of the Bodhi Tree - Ajahn Buddhadasa


You can find it on amazon, doesnt cost to much and it gets to the heart of what Buddhism is all about


As for the Four Noble Truths - Dukkha (stress, suffering, dissatisfaction) comes from wanting things to be different


When I sit in meditation for a long time then cramp appears. If I "want" the cramp to go away then there is dukkha. However If I accept the cramp is there and see it as it is, just a physical sensation that is impermanent, dukkha and not self, then the dukkha "dies" and there is ease



Now the first noble truth is there is dukkha, which can be summed up as clinging to the aggregates (body, feeling, perception, thoughts etc and counsciousness)

So for example if there is clinging to the body there will be dukkha if there is cramp

the cause of dukkha is ignorance which leads to craving and attachment - We are ignorant that the aggregates are impermanent, dukkha and not self and so we grasp them which leads to the situation above

The cessation of dukkha is the cessation of craving - By seeing/experiencing the impermanence, dukkha and not-self of the aggregates then you will naturally not crave and cling to them and so no dukkha will arise


The way to cessation of dukkha is the Noble Eight Fold Path - Practice this and it leads to full understanding of the three marks and so the fading away of ignorance, craving and attachment and freedom from all dukkha, i.e. nibbana


Hope that was helpful