Say goodbye to the old and welcome the new. This phrase is usually used as a New Year's greeting. This phrase means "say goodbye to the old year and welcome the new year."
And discarding the old and welcoming the new also has this meaning, abandoning the old and replacing it with the new.
However, not everything needs to be discarded or replaced when it is old or broken.
In fact, in addition to replacing new ones, you can also consider repairing, correcting, and refurbishing.
The Well hexagram in the Book of Changes implies that you should not forget your original intention and it is recommended to consider maintenance first. As long as you do the maintenance well, you will benefit in the end.
This basic meaning can also be extended to mean that as long as we continue to enrich ourselves and continue our studies, our future achievements will definitely be able to benefit society.
# Well
English 
Chinese