"This is my door."
Translation:Das ist meine Tür.
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Dieses is used in front of a neuter noun: Dieses Haus ist schön = "This house is nice"
Diese is used in front of a feminine or plural noun: Diese Tür ist geschlossen = "This door is locked"
If you don't have a noun directly after it, then you use dies: Dies sind meine Kinder = "These are my children"
Tür is feminine, but dieses is for neuter nouns. It doesn't fit together.
Better is Dies ist meine Tür. That's like saying "This is my door", where "this" doesn't have any 'gender information' on it at all. If you say Diese ist meine Tür you're more strongly giving information to "this", making it more like "This door is my door" or at least "This one is my door".