First, because of backwards compatibility design, you can always plug a USB 2 cable or device into a USB 3.2 port and it WILL work at the slow USB 2 speeds. But that is not a good use of those ports. To use older USB 2 devices, I suggest you use the USB 2 facilities of the mobo. However, like many boards of this design, there are NO older USB 2 sockets exposed on the rear panel. You can do what I did on my machine. Get a port adapter plate with TWO USB 2 ports on it like this
Mount that in an unused rear PCIe slot, and plug its two cables into the F_USB1 header of your mobo - see manual p. 20, key no. 14 and p. 14. This gives you two USB 2 sockets on your case back for use with older USB 2 devices.
There is NO reason to use any adapter to connect a mobo USB 2 header to any USB 3.2 Type A socket. For such sockets to function at the faster USB 3.2 speed you MUST connect it to a mobo header of that design.
There is NO adapter between Gen1 and Gen 2 versions of USB 3.2. They use the SAME connectors. The only difference is that we are told that using a USB 3.2 Type A socket and plug system may NOT perform at the fast Gen2 speed of 10 Gb/s max, but using the newer Type C socket / cable system will IF the mobo port is of the Gen2 design.
On your mobo there is ONE mobo header available to connect to external USB 3.2 sockets via a cable. This is what you use to connect the front panel sockets of your case to a mobo header, by plugging into that header the cable that is pre-connected to those front sockets. On your mobo, that is the F_U32 header (see p. 19, key no. 13 and p. 14). That header is Gen1 only, so it can be used to feed either Type A or Type C sockets on your front panel, but it will perform only at the Gen 1 speed of 5 Gb/s max. This header contains TWO ports, so you can feed two front sockets from it with one cable. Your case top front panel has three USB sockets on it. Two of these are Type A and labelled "USB 3.0", which now are called USB 3.2 Gen1 and are fed by ONE cable that goes to this mobo header. It also has a Type C socket labelled "USB 3.1 Gen 2", which is now called USB 3.2 Gen2. It is fed by a separate cable which ends in a Type E connector for that style of mobo header, and your mobo does NOT have such a header. Since the only mobo header you have already is going to be used for the two Type A sockets, you have no place to plug in this cable that feeds the Type C socket. IF you have a device with a cable ending in a Type C plug and want to plug it into a top front Type A socket, you can get an adapter like this
NOTE that this one specifies that it does work at the Gen1 USB 3.2 max speed of 5 Gb/s, and is NOT limited to the older USB2 specs.
That covers the mobo headers and how to use them for external sockets. Now look at the sockets pre-mounted in your mobo's rear panel. See manual p. 11 - 12. It has three USB 3.2 Gen1 sockets of Type A design (key no. c), plus another of these (key d) that can be used like the first three, but also is the particular port for use when updating the BIOS using the Q-Flash system and a USB 3.2 Gen1 memory stick. So you can plug ANY USB 3.2 device into any of these sockets and work at Gen1 speeds. Then it has two other sockets that are the USB 3.2 Gen2 faster (10 Gb/s max) version. But of these two, only item h is the Type C socket guaranteed to work at that speed, while item g is a Type A socket (red insert) that MAY work at that speed, or may work a bit slower. This does give you the possibility of using faster Gen 2 speeds with EITHER type of connector on the attached device's cable if you get such a device later. These last two sockets are the only ones your mobo provides at the faster Gen2 speeds. Again, you will NOT need any adapter to work with any of these rear sockets.