How do i know my yugioh cards are real or fake?

Check the spelling, see if it's correct. If you notice any errors, it will be a fake. Check on the back of the card, see if "Konami" is spelt correctly, if it isn't, it's a fake. You can check the number of stars on the card. Compare it to a guide and see if it is correct. The real card should have a gold or silver hologram on the bottom right hand corner. It looks like a shiny square. The hologram should look like the symbol of the Millennium Eye. If there isn't one, it's a fake. If the card feels overly glossy or not glossy at all, it is usually fake. You should read the text to see if the font is too thick or thin. Or maybe there will be spelling mistakes. Look at the picture closely. It might be a bit blurry or have a poor quality. If the colour of the card is too pale or too bright, then it's a fake. If the ID number (under the picture on the right hand side just above the text) is missing, it's fake. On the back of the card, if the TM, Konami or R symbol are missing, it's fake. If it doesn't have a serial number in the bottom left hand corner, then it's fake. Hope I helped. :)

if it came in a wrapper you 99.9999999999999999999999999999999999999999999999999999999999999999999999975845765467462354367475346547646584674674674565642432465756976743525784668764785263984053082569078% in the clear