VERY IMPORTANT!
Since Hollow Palm Technique is not something you can get instantly, you need to level with some other skills before then.
If this is a league start character, the make sure to buy a
Hardwood Spear from Renly and use the Uncut Skill Gem to get
Whirling Slash or create a Huntress and transfer the gear to your Monk.
Clearfell
In Clearfell (the first map), there should be an Abandoned Stash in the Mysterious Campsite where you get another guaranteed Uncut Skill Gem - use that to get
Twister.
Then, head into The Mud Burrow and defeat The Devourer to get another Uncut Skill Gem to upgrade your
Twister. Then with the Uncut Support Gem as the quest reward, get Retreat I and link it to
Twister.
At this point your main combo should be
Whirling Assault ->
Twister.
Grelwood
In Grelwood, make sure to find Areagne's Hut - kill her to get an Uncut Support Gem. Use this to get Martial Tempo for
Whirling Slash.
The Red Vale
After completing The Red Vale, The Rust King will drop another Uncut Skill Gem - use this to upgrade
Twister. The levels for
Whirling Slash don't matter, so prioritize
Twister.
The Grim Tangle
In The Grim Tangle, kill The Rotten Druid to get another Uncut Support Gem. Use this to get Rage I for
Whirling Slash.
Cemetery of the Eternals
In The Cemetery of The Eternals, find The Sarcophagus (an interactable) for a chance to get an
Iron Ring.
In The Tomb of The Consort, you can defeat the Rare monster that spawns from the Haunted Chest (another interactable) to get another Uncut Support Gem. Use this to get Projectile Acceleration I for
Twister.