UV Unwrapping - Lessons Learnt

For this post, I am going to go through what I have learnt about UV unwrapping. Correct UV:

Wrong UV:

With just one look, it is obvious that both UVs are different. I have learnt that instead of cutting the UV of the face according to what does not overlap, I should cut the UV edges along the top of the head to the back of the head and around the neck, to detatch the UV of the head and neck. By doing so, it allows the face UV to stick together and be folded into a nice half, unlike the wrong UV. Although I have done correctly the part where I cut the UV of the front and back hand, I failed to have a UV, as seen by the checkered pattern on the model which has the wrong UVs. I should have cut the arm UV separately from the hand UV and then cut the front and back UV differently. I have learnt that by cutting the UV edges, it results in something called seams which can be seen when textured, unless I use a seamless texture so I whenever I cut seams, it should be in areas what it is not very obvious if not in areas that cannot be seen, for example, the top of the head which would be covered by the hair. I have also learnt that it is only when I have cut the proper and necessary edges that Maya would then be able to unfold properly. Additionally, parts like the hand UVs have to be sewn later together to provide a more seamless and complete UV.