Left Hand: Hold Down (2) or Back + Down (1)
Right Hand: Tap Up + Attack (8 or 9)
With the vertical charge motion, you can continue to hold Down (or Back + Down) while you press Up - this is due to the Absolute Up priority mentioned above.
In addition, you can use your right hand to press the Up and Attack buttons at the same time.
This is one of the most precise and strongest techniques in the game on Hit Box.
Back (4) or Down + Back (1)
The horizontal charge on Hit Box is intuitive. Simply let go of your charging direction and then input your final direction and attack at the same time.
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If you have any questions about Guilty Gear -STRIVE- on Hit Box, please join our community on Discord and visit the #airdash-fighters channel. In addition, be sure explore the "Hit Box" and "GG" tags at the bottom of the post for more How-To content.