There are several prominent scientists and scholars who have written extensively about ethical definitions and practices. Here are a few notable ones:

We have also been writing about moral and ethics in health-care.

Perhaps the first books with the express title of ethics, and the books that have had the most influence over the centuries, are those by Aristotle: his Nicomachean Ethics, his Eudemian Ethics, his Great Ethics (the authorship of the last is disputed). The most read and most influential is the first. Any contemporary discussion of Aristotle and his ethics will refer also to the many ways his ethical thought has been followed, rejected, criticized, corrected, replaced, etc. over the intervening centuries up to the present day.

A search online will reveal innumerable sources and summaries.

Ethics is a branch of philosophy that studies human behavior and the foundations of its values. As an academic discipline, it studies morality, understood as the set of customs or norms that govern human conduct or behavior in a community and any area of ​​life. Ethics is a reasoned way of delving into the meaning and importance of moral concepts and issues and evaluating the merits of ethical judgments and standards.

I believe that the best definition of ethics is the one that defines us as humanity, it is the definition in which we recognize vulnerability, we are supportive, we respect every person, and we exercise our freedom to help and recognize our mistakes.

Ethics is the study of moral values and norms that ought to guide human conduct

https://plato.stanford.edu/entries/moral-theory/