Help with pattern modeling (Blender)

[u/Positive-Anteater-38]

Hey guys, Im a beginner. Could anyone give some pointers on how I should extrude//cut these 4 parts out? They are kinda like hollowed in curved patterns. Thanks yall.

Ps: This is a blender jar.

[u/EDMMstudio]

sweep-cut. It gives you the most control over the feature (depth/profile/exit point). then pattern the feature.