It's practically impossible for any individual to read and understand all the Hindu scriptures. What is the minimum set of scriptures which a person needs to read and understand the philosophy of Hinduism?
If you strictly go for the minimum set 'BHAGWAT GITA' contains all. It is the set of most important tenants to listen and perform as per Sanatan Dharma.
Further to clarify on your word 'It's practically impossible for any individual to read and understand all the Hindu scriptures.' You can read all, yes but understanding is a difficult job. Even understanding one line might take years, depending on your knowledge and perspective. To make this easy you need to acquire a Guru, Bhagwat Gita will not be able to do the 'most' good without him if your understanding and perspective both are small.