@Treedream There is a think a misconception that when stocks go down, bonds tend to go up. That is largely untrue. Bonds would be an "ideal" hedge if they were truly negatively statistically correlated with equity. There are instead "lowly correlated". Except for the most recent downturn that was driven by rising interest rates, the largest drop in the broad bond market during a recession was about 7.5% (while the market often goes down 50%!)
The current downturn is sort of upending conventional wisdom as, at least for awhile, bonds and equity have become highly correlated. This has largely negated the value of diversification.
If you want to understand this from an academic finance perspective, there is plenty of information published online that doesn't require you to get an MBA (big waste of time on my part!) The key ideas are all published under something called the Capital Asset Pricing Model (CAPM). The key findings (which I was once forced to "prove" [and I mean ad nauseum using the One High And Holy Mathematics]), is that the statistically ideal diversified portfolio was composed of 10% [long dated] treasuries, and (about) 28 uncorrelated stocks. Finding 28 uncorrelated stocks is a real devil but you can get "close" by spreading your picks out across all the broad market sectors.
From the CAPM, comes a lot of industry machinations that have turned into the 60/40 bond/equity portfolio. Lots of variations exist that include allocations to Cash, Gold, Commodities, etc.
The real answer (academically) is no one knows the optimal way to invest. Most academics believe in the Efficient Market Hypothesis and just recommend indexing.
Note that all the mathematical machinations of the CAPM are designed to mitigate only a single kind of risk. There is "academically" systemic and non systemic risk. Only one can be hedged. And only in a statistical sense. The real world is not compelled to comply with any academic's model and assumptions.
HTH