As Steve started to put together his aquarium, his mom noticed that he hadn't gathered the tools he would need for the project. "Wait, Steve, don't put the cart before
the horse," his mom said as she watched him. "Make sure you have everything you
need before you begin."

What do you need? The explanation of the phrase?

Explanation:

Don't put the cart before the horse means put the priorities first instead of doing other things. Steve started to put together the aquarium, but didn't get the tools.

being ignored by someone and then accepting the fact was really tough

the answer is emerged from.

orpheus descended to hades, the world of the death to rescue eurydice. no mortal had ever done this before him, he survived because he was protected by the gods. the word "underworld" gives us a clue, he emerged from it like a whale emerges form sea for exemple.