>ve product which is why someone would use Fidelity for FXAIX vs Vanguard for VTSAX. Purchase them if you're using that broker but generally these mutual funds also have a ETF equivalent and in VTSAX case that would be VTI. If you really want VTSAX you can buy VTI with your Fidelity account.
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>I don't see much difference between VTSAX and FXAIX and comparing their historical returns are within .5% of each other and their top 10 holdings are the exact same but with different weightings.

you can be aggressive until your late 30s or early 40s. Since you are just starting.