Mac - Can't Install HomeBrew because Curl is Missing - bash

Question

I tried to install homebrew onto my mac, but I couldn't because curl wasn't found. I typed:
ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
This returned this error:
-bash: curl: command not found
So, I tried to install curl but apparently to install curl, I need to use curl? This is what I found:
Run in Terminal app:
ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)" <
/dev/null 2> /dev/null
Run:
brew install curl
Done! You can now use curl.
However, this uses curl to install curl, so it gives the same error message: -bash: curl: command not found
TL;DR, how do I install curl on mac without using curl

Answer 1

I solved the problem!
To use bash on mac:
Go to terminal ––> preferences
Click on Shells open with: and set it to Command (complete path)
Enter one of the following:
/bin/bash
/bin/csh
/bin/zsh
/bin/zsh-4.0.4 (Mac OS X 10.2.8 or earlier)
/bin/zsh-4.1.1 (Mac OS X 10.3 or later)
/bin/ksh (Mac OS X 10.4 or later)
/bin/ksh worked for me
Source

Answer 2

I thought I broke my curl symlink somehow too, and somewhere in there I ran into your same issue, where no command would work. Somewhere in this mess, I fixed it.
https://brew.sh/
The main website requires you to install wget, maybe it gets deleted when you uninstall homebrew.
Regardless I found a way to install it using Ubuntu commands.
https://xmrig.com/docs/miner/build/ubuntu
but ran into an issue where I had to download cmake from the developer website and add it to the path in it's menu options on Mac OS X 10.11 to compile and run my program as ./program instead of program, then I installed macports(opened a new terminal window), and installed hwloc with macports, to no avail, just getting totally different errors.
I've also tried to add curl as an alias of curl into the bash profile and it recognized the error after I used this;
https://github.com/Homebrew/homebrew-core/issues/5084
However, I forgot I have an identical computer that is working just fine, but when I run "which curl", in the working computer, I get /usr/bin/curl, instead of /usr/local/bin/curl, so I ran
export PATH="/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/bin/curl"
I'm still getting the error, so I used vim, to sudo edit the /etc/paths file by using
sudo vim /etc/paths
i for edit
esc to exit edit mode
:x to save
Restart Terminal
Still getting a 403 SNI Error cannot download Python 3.9
rm -rf /opt/local/bin/curl
rm -rf /usr/local/bin/curl
which curl finally returns the correct path, /usr/bin/curl
exit
Restart Terminal
Still same error so I removed /usr/bin/curl from /etc/paths, and export file. Also deleted the bash profile, as the working computer doesn't return one, and...still the same error, so I conclude that "curl is not in path" should be ignored.
I did get brew doctor to return with no errors.
brew upgrade curl
curl not installed
brew install curl
403 Error SNI is required.
brew upgrade openssl
openssl 1.1.1j already installed

Answer 3

In my case, I made a mistake while editing my $PATH.
I would recommend looking at all your ~/.bash_profile and ~/.zshrc.
Remove ALL code related to $PATH. Carefully add things back in.