Ok
10 openings not to play as black

That is a really weird list. There are some openings there that are completely fine (like the Scandi, the Budapest, the Grob or the Philidor), mixed with some insanely bad stuff (like 1. e4 a5 or 1. e4 h5).

OP: "Never play these openings! You'll just lose!!!""
Also OP: Lists 5 completely sound openings that are played at the master level

OP: "Never play these openings! You'll just lose!!!""
Also OP: Lists 5 completely sound openings that are played at the master level
There are much better openings like sicilian, caro kann, modern, and ruy lopez
"This is for people who have a rapid/blitz rating less than 500."
++ For those people it does not matter at all.

OP: "Never play these openings! You'll just lose!!!""
Also OP: Lists 5 completely sound openings that are played at the master level
There are much better openings like sicilian, caro kann, modern, and ruy lopez
better by what standards? Ruy Lopez isn't even an opening as black either lol

OP: "Never play these openings! You'll just lose!!!""
Also OP: Lists 5 completely sound openings that are played at the master level
There are much better openings like sicilian, caro kann, modern, and ruy lopez
better by what standards? Ruy Lopez isn't even an opening as black either lol
Oh right
one must fully decline any gambit presented and actively not take hostage any enemy troops and perform the countergambit opening merge known as the botezcloud where one plays Ke2 and follows up the attack with Qf3, pushing aside the king since females first, and taking immediately on f7 not even waiting for black to move. Known as the botez gambit combined with bongcloud, one of the deadliest combinations in chess history.
when you have fulfilled your destiny by performing this dangerous countergambit, you will be given your indulgence towards chess mastery

Borg is grob spelled backwards
Look at explorer, grob is 1.g4 and Borg is 1. e4 g5

uh scandi is sound and learn to count
you dont have to "pUt iT rIgHt bAcK"
philidor is like actually good
no one calls e4 nh6 the hippo
b6 bb7 d6 nd7 e6 ne7 g6 bg7 is hippo or you can say it is also a6 and h6 added on
alekhine is fine

OP: "Never play these openings! You'll just lose!!!""
Also OP: Lists 5 completely sound openings that are played at the master level
There are much better openings like sicilian, caro kann, modern, and ruy lopez
modern=philidor and maybe scandi
This is for people who have a rapid/blitz rating less than 500. These are bad openings for black
I will show each opening that is bad (10 is bad, the lower the number the worse the opening)
10. Borg defense 1.e4 g5 Borg is like modern defense (1.e4 g6) but instead of preparing to castle it makes your king side bad. People can get your rook, because it leaves it open. Then king side castling is useless
9. Scandinavian defense. (1.e4 d5) The scandinavian usually ends up giving black bad development because white will take then to recapture you need to develop you queen then your queen will be attacked then you have to put you queen right back.
8. Philidor defense. (1.e4 e5 2.Nf3 d6) Makes it harder to develop your king side bishop
7. Hippo defense. (1.e4 Nh6) Allows your opponent to gain center control but protects your f pawn
6. Budapest gambit. (1.d4 Nf6 2. c4 e5) Ok, this may misplace your opponent's d pawn but then your king side knight kinda turns less useful
5. Goldsmith defense. (1.e4 h5) Your opponent gains a TON of center control. But can help with preventing 4 move checkmate.
4. King pawn's opening Ware defense (1.e4 a5) Same with goldsmith but doesn't protect or help with 4 move checkmate
3. Duras Gambit (1.e4 f5) No king safety
2. Alekhine's defense (1.e4 Nf6) It chases your knight around and might trap it
1. King pawn's opening. Barnes defense (1.e4 f6) It might get you checkmated
Link to my other forum worst openings as white. My other forum describes some of the confusing words in this forum https://www.chess.com/forum/view/for-beginners/top-10-openings-not-to-play-as-white