#2 QGIS - How to split a polygon layer

Four easy and fast ways to split a polygon layer into separated features.
Timecodes:
00:23 1st way split it with another polygon layer
01:09 2nt way split it with a line layer
01:44 3rd way split it with line (manually)
02:04 4th way split it with line #2 (manually)
02:36 Multipart Split tool
Please write it in the comments, if you have any advice to improve my tutorials or suggestions to further tutorials.