pay for a “complete solution manual” on eBay or Chegg. Such products are either fake, illegal, or dangerously incorrect.
The book is notorious for its dense problems. Each section contains 20–40 exercises ranging from mechanical verifications ("Show that the center of a group is a subgroup") to multi-part proofs that stretch over a full page ("Classify all groups of order 56"). Dummit Foote Abstract Algebra Solution Manual