Crash Bandicoot 4: It's About Time - All Bosses and How to Beat Them
Here's how to defeat every boss in Crash Bandicoot 4.
Stage Dive — N. Gin

After the cutscene, you'll be at the end of a narrow conveyor belt. Stay where you are — some fast-moving baddies will be launched at you. Spin them all back to destroy the giant speaker in the background. After this, you'll have a limited time to hop up and attack N. Gin.
Next, you'll be back on a wider conveyor belt and will have to dodge some drum beats that come towards you. Jump over the green ones and duck under the red ones. Enemies will be launched at you — spin them back to destroy the speakers once again. You'll need to use the Lani-Loli mask to reach N. Gin and hit him again.
Back to a wider still conveyor belt. As before, you need to dodge the green and red beats and spin attack the enemies that come at you. Then, use Lani-Loli to get up to N. Gin and hit him a third time.
Finally, you'll have to dodge the beats once again, only this time using a series of small platforms. Enemies will appear on platforms ahead of you — reach them and spin them to destroy the speakers. Then, use Lani-Loli to reach N. Gin and attack him for the last time. Job done.
Jetboard Jetty — Louise

A surprise boss battle at the very end of the level, Louise is a big sea monster that will attack you with tentacles. You're on the jetboard so you can't attack directly. Instead, you have to lure the enemies that slowly chase you into the tentacles, which damages Louise.
You'll also want to keep an eye out for where Louise's attacks will land. She slams down the tentacles, but the area affected is highlighted, and there are a couple of seconds warning before she attacks. Keep riding around, guiding the enemies into the tentacles, and you'll beat the boss in no time.