Saves for easier passage, both open all the main story items: a hook, boots for swimming under water, etc. which will simplify the passage from scratch without using cheats, and will allow you to collect more loot in inaccessible rooms right away. You can die and start again with all the tools.
1 save in the citadel shortly before the boss, before changing the world (such as a checkpoint)
2 saves before the last boss (the checkpoint after death will already be in another world)
Copy to C:\Users\%user name%\AppData\Local\Returnal\Steam\Saved