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Trying to Calculate Built-up Class area using ESA LULC

You're maksing off everything that isn't class 50, but then you're multiplying that by the pixelArea. So, instead of this: var urban_pixelarea = urban_area.multiply(ee.Image.pixelArea()); you ...
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Calculate how many points are located within certain land cover classes - QGIS

You need to use JOIN ATTRIBUTES BY LOCATION feature in QGIS. Processing toolbox -> Vector General -> Join Attributes by location Select your point layer for features and the land cover layer ...
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Calculate percentage of points within land cover classes QGIS

You can achieve this using a virtual layer. Go to the menu Layer > Add Layer > Add/Edit Virtual Layer... and enter the following query. Modify pt.cat for the name of your category field as well ...
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