China DOS Union

I downloaded freedos9.1beta from freedos.org, but when burning it to a CD I didn’t make it into a bootable CD, so I installed it directly from j:\freedos\setup\install. The detailed situation is like this:
from
j:\freedos\packages
to
c:
Then I just kept pressing Enter all the way through, but after rebooting, c: still won’t boot
??1: How do I install a complete FreeDOS
??2: How should I set up FreeDOS’s config.sys and autoexec.bat
??3: How do I burn a bootable CD
??4: Why can’t the graphical installer run during installation

Also

If I install DOS7.10 on drive c:, does that mean I can’t install FreeDOS anymore, including PCDOS2000
??5: How should I install these three operating systems on one hard disk
??6: Under pure DOS, is there any multi-boot software? Can someone tell me the detailed way to use it

In earlier posts there was something about how to use USB 2.0 under DOS. Could some expert explain it in detail

??7 Also, how do I drive a USB 2.0 flash drive

For example, my machine is pure DOS, and the flash drive is a Netac DH, but the Netac website only has a driver for 98. Which driver should I use so that pure DOS can detect it and assign it a drive letter

Thanks, experts
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My machine is still pure DOS, but I’ve discovered that nowadays it still has a lot of inconveniences

Use a multi-boot manager to do it, for example the one built into WinNT/2K/XP, or GRUB, and so on would all work.