As of 2021 and beyond, the most modern way to manage saves is actually via the open-source engine reimplementation called . While it is a game engine, it includes a debug mode and save management tools that act as a built-in editor, allowing you to teleport, add items, and modify stats on the fly.
: If you prefer a manual approach, you can use a hex editor like XVI32 to directly modify the binary data within .DAT files, though this requires technical knowledge of the file's structure. How to Edit a Bin File save editor fallout 1 2021
What are you using (Windows, Linux, macOS)? As of 2021 and beyond, the most modern
The capabilities of a modern save editor like F12se are extensive: As of 2021 and beyond