I’d like to recommend the work of Sue Hamilton, a British Buddhist scholar. Be warned though, this is dense academic stuff requiring some work and patience to understand. If you’d like to dip your toes in, try A Handful of Leaves which is only 12 pages long.
Hamilton explores the earliest sources (rather than also looking at the Abhidhamma and commentaries) and I’ve found the conclusions she (quite painstakingly) comes to, very helpful, clarifying and simplifying. The Buddha, Hamilton says, is not interested in ‘what a human being is’ but rather, ‘How a human being works.’ For Hamilton (and myself) the Buddha is a pragmatist, offering help in making human life work better, rather than worrying about trying to answer philosophical questions.
In the paper above, she looks at the question, ‘If there is no self, what is it that is saved?’ And concludes that the Buddha would have remained silent in the face of such a question, being interested instead in the way that human conditioning works to keep each human fettered. She points instead to how each of us might directly know the way that the process that keeps us in ‘the round of [subjective] samsara’, works.