How to Add A Level Failed Screen

I want to add a Checkpoint to a certain level where the player has to reach a specific point
I want to know three things
1.How to make a checkpoint where it autosaves
2.How to make an objective (Example: Get to the chopper)
3.How to make a level failed screen that has a button to take you to the last checkpoint
Please Note that i am an Absolute NOOB at unity so please explain very simply to me
Thanks

hi watch these videos,they will help you .

part1
https://streamable.com/emvp8

part2
https://streamable.com/frcw4

part3
https://streamable.com/t77ge

part 4
https://streamable.com/vslsn

part5
https://streamable.com/u3cox

you said that you’re new to unity,so these movies about how to create a character,create animation,craete enemy ,create checkPoint and doing the respawn things.