Graphics card (VGA)

Please tell me !

1. Can I install 2 VGA Cards on one Mainboard?
2. Can I install all Ram DDR3, DDR4, DDR5 on one Mainboard? I have DDR3 4G, DDR4 2G, DDR5 2G

Best regards,

Remark: I can read Thai language, but I can not write. Please answer me by Thai language.