Well, you never know it's gonna be a crash so there's never "just before crash".

But definitely "never keep all your eggs in one basket". At most a quarter of all your net worth in stocks and that only if you enjoy having heart palpitations and have mentally resigned to kissing good bye to that capital. Stocks is gambling, advising someone to "invest" is same as "go gamble your money in Vegas". Would you still put your hard earned money in it if you realized what a sham the stock market is?

Real estate, land, ca$h in the bank. Stay out of gambling. But of course the establishment will never give you the last part.