[SOLVED] How to check if my PC can support 1 SSD and 2 HDD?

Solution
6 x SATA 6Gb/s ports, 1 x M.2 slot

conclusion:
6 HDDs/SSDs "traditional" SATA
or
5 HDDs/SSDs "traditional" SATA + 1 M.2 (nvme or SATA interface)