above video explains you the whole concept of equal area cylindrical projection.
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You can also watch -
CONICAL PROJECTION
1) one standard parallel conical projection - https://youtu.be/C0XHMJL5lEc
2) conical projection with two standard parallel - https://youtu.be/asDl6VWCLXc
ZENITHAL PROJECTION
1) polar zenithal equidistant projection - https://youtu.be/WLtgKmd4820
2) polar zenithal equal area projection - https://youtu.be/lYgHDm6gLu8
