I like vanilla gameplay, so I don't install mods that add features like new entities, etc. I use quality of life mods:
DaFlight (for creative mode: plans, videos, etc)
Inventory Tweaks
Optifine
Shulker Box Viewer
WorldEdit
WorldEdit CUI
Xaeros Mini/World Map
I'll be adding Light Level Overlay, Schematica, Village Marker, and maybe Better PvP. (I don't PvP but if it shows mob health it'll be a big help.)