B450,
X570,
A520,
A320,
B550 are
RYZEN cpu chipset's.
A320-
the absolute minimum requirement for a RYZEN cpu,come in mATX form factor,often with only 2 DIMM (RAM) slots,1 PCIe x16 slot (GPU slot),cant overclock. Often support only 1st and 2gb ryzen cpu's,but some support 3rd gen,poor ram speed support.
B450-
medium range chipset,come in mATX,miniITx,ATX form factor,often come with 4 DIMM slots,often with 2 PCIe x16 slots,can overclock. support 1st,2nd,3rd gen,some high-end b450 boards support 5th gen cpu's,solid ram speed support
B550-
high end chipset ,come in mATX and ATX form factor,come with 4DIMM slots,2 PCIe x 16 slots,have better overclocking support than b450,support only 3rd and 5th gen cpu's,good ram speed support
X570-the highest end chipset,come in miniITX,mATX,ATX form factor,ussually come with 4DIMM slots,2 (some even 3 ) PCIe x 16 slots,often the best chipset for overclocking,support 2nd,3rd and 5th gen ryzen cpu's,the best ram speed support
A520-
'better' version of A320,come in miniITX,mATX,ATX form factor,ussually come with 2DIMM slots,ussually 1 PCIe x 16 slot,cant overclock,support 2nd,3rd and 5th gen cpu's,decent ram speed support.
Generally for 3600,i would either recommend a high end B450 board like
this one,or a B550 board.
The B450M-K is a really good motherboard for this cpu.