This is great advice.

Remember, though. You can still get it, even if you do all that. Having cancer is not a moral failure. Even kids may get it.

Realizing, not in a philosophical way, one way way or another, that we will die, is something that changes you. Fewer reasons to accumulate fame and money. More reasons to make yourself happy in this life.

You cant really be happy if you completely lack money either.

Sleep well and drink lots of water. Avoid the summer sun at noon, but do get some sun on your body, .. in general, get out of your basement sometimes.

Is this a widely held opinion ? It’s doesn’t seem intuitive that sleep and water have an affect on bone cancer or really any type

It is a widely held opinion, that sleep and water have good influences on your overal health and good overal health is linked to less cancer and some other benefits.

I don’t think you should avoid exercise daily.

Sadly, the English language is not precise enough for me to express what I wanted in a compact way. Recently I have been learning Ukrainian and there is a language where it is easy to precisely express this kind of thought due to the many different forms of "and", word terminations indicating expected noun context, and different rules about punctuation.

Exercise daily and avoid sugar, alcohol and bacon.