The most detailed tutorial with step-by-step teaching

The task is difficult; take it step by step.
Prepare 90u of base usdc and 10u of base eth for the second task.

First exchange usdc, this step must be set, otherwise the swap will not succeed.
Scroll up, click on 'Advanced Settings', set 'Gas for Destination' to 'None', and then close the menu.

Then exchange usdc over 80u for usdc.e on hemi (once done, you can exchange back, don't rush to exchange the upcoming eth, it will still be useful)

Exchange approximately 3u of base eth to eth on hemi (you will need it for future hemibit exchanges; it is recommended to directly exchange 70u of ETH on humi).

The third and fourth tasks are very complex; you need to search for sushi in the discovery section first.