There's paywalled sites and then there's the tools you get at Schwab, e-trade, Fidelity, TDA, (maybe Vanguard, their apps investment is lagging), which have detailed info about std dev total returns, Sharpe/sortino ratios, correlations, tax consequnces on a large universe of assets

- quarterly pays,

- preferreds

- laddered investment grade bond portfolios,

- asset and mortgaged-backed

- high yield bonds,

- REITs, hot sectors are cell towers, datacenters, p ersonal storage units

- LP, MLP (especially energy pipelines) royalty trusts

(and that's just US domestic... )

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this vid (Ben Felix) about JEPI/XYLD type "covered call" etfs is instructive https://www.youtube.com/watch?v=YMLVdY8y8vM&t=312s