Octave Software Download Link:
https://www.gnu.org/software/octave/
Octave User Guide:
https://octave.org/octave.pdf
Books about Octave & Matlab:
https://wiki.octave.org/Publications_using_Octave
Octave Talk Slide DeckDownload
Octave Example FilesDownload
Octave Day 2 Example Files including command sheetDownload