Questions about Samsung Galaxy A8 2018

Yes - as mentioned in the specifications (in the SIM section), the SIM type is "Dual SIM + SD" and if you hover over the info-i there, it says "The device has 2 SIM slots and one SD card slot (memory expansion). Consequently, the mobile phone can hold 3 cards at the same time."

Yes, sure, it always comes with it, you don't have to decide whether you want a second SIM or memory card, it's all there. With other models, you have to decide between a second SIM card or a memory card. The A8 is excellent, I can only recommend it. e.g. here Samsung Galaxy A8 2018 (5.60", 32GB, Dual SIM, 16MP, Gold) buy another 64Mb microSD card, perfect