While trainers use their own shortcuts, D2R has built-in offline commands that every player should know. These don't require external software and are considered standard "shortcuts" to a better experience:
Grant yourself extra Skill Points to max out multiple trees for testing purposes. diablo 2 resurrected trainer offline hot
Enhancing Your Diablo 2: Resurrected Offline Experience: Trainers, Tools, and Tips While trainers use their own shortcuts, D2R has