How should I proceed?

New to this community and find it very resourceful.

30yo here. Started working last year as a full time professional and make over 6 figures now. Last year, started a Roth for both I and my partner and maxed them out with 100% in FSKAX. Partner doesn’t work now but will start working after graduating in 2 years and will be making similar income. No kids yet.

Have built 6 months of emergency fund. Can max out this year’s Roth for both I and my partner. My question is if I should max them out in one go or should I break it down in multiple small portions?

Other than retirement accounts, how much does the general consensus recommend investing every month out of the total income? What are some of the stocks/funds that everyone recommends in taxable accounts?

Thanks everyone for their inputs!