How to Learn from Blog Post

i am trying to learn to ml "image segmntation" but when i try to learn it and want to apply in my own data it won't work why because of most of top blogs from where i learn uses the same kind of dataset "in my case binay image segmentation where mask of images already given by the data publisher" but in i need to segment 200 different categories of food and also i got dataset in coco formate so it means i need to make mask but how because none of blogs in top results show me , i am kind a demotivated now, help me how to learn from yt vidos and blogpost