I agree with #1 20% is a pretty good margin to go off of if you can. I personally have contributes going into things like an HSA and Roth IRA then I put some money aside as like “emergency funds” in case something happens. I’d recommend doing a monthly cost breakdown and seeing how much you can comfortably save with your current expenses then see where you can save more need be
It really depends ur financial situation. If ur living paycheck to pay check and still going into debt, save differently than the person who has excess income. I saw 3-6 months of expenses is good goal. Ive heard that after you hit 3 months worth you split it between saving and investing, then once you hit six months, you go all into investing. The percentage you put into that really depends on situation though, 20% is a good standard, but still really depends.