If you want to check the book out before buying, major retailers offer free samples (usually 10-20% of the book).
The most reliable way to download the EPUB for free is through a public library. Most libraries now offer digital lending services. If you want to check the book out
Pros: Completely free, legal, supports the author. Cons: You may encounter waitlists (popular books often have holds). Pros: Completely free, legal, supports the author
Searching for "free ebook download" on open web browsers often leads to unsafe territory. Here is what you need to know to stay safe: Pros: Completely free