This is a good guide to get started with homebrew, just make sure the "update to v11.1" message hasnt popped up on your 3ds yet...
Also for save data managing, look into either this:
https://gbatemp.net/threads/save-data-manager-and-editor-for-firmware-up-to-9-9.396245/
Or this:
https://gbatemp.net/threads/svdt-save-data-explorer-manager.396562/
If you need any help with putting homebrew applications on your 3ds, just ask.
Regardless of whether or not the update message has popped up, iirc, Browserhax will not work anymore on 11.0.