This comprehensive guide explores Ethereum GPU mining software solutions in the post-Merge era, addressing the fundamental shift from proof-of-work to proof-of-stake consensus. Readers will discover how mining software functions, detailed comparisons of top solutions like ETHminer and PhoenixMiner, and step-by-step setup procedures for Windows, Linux, and macOS platforms. The guide covers critical security practices to avoid scams, mining pool selection strategies for maximizing payouts, and hardware versus cloud mining comparisons. Since traditional Ethereum mining ended with the Merge, the guide emphasizes viable alternatives including Ethereum Classic, Ravencoin, and Ergo for miners seeking to repurpose existing equipment. Essential topics include troubleshooting common installation errors, optimizing mining operations through major crypto platforms like Gate, and understanding the current landscape where technical expertise remains valuable despite ETH mining's transition to staking.