I. Installing Terraform

Via HomeBrew

Make sure you have homebrew installed, then use the following commands.
To Install home brew check the below page for step by step instructions.

brew tap hashicorp/tap
brew install hashicorp/tap/terraform

To uninstall terrafrom via homebrew

brew uninstall terraform
terraform --version
#if uninstalled, "command not found" messsage.

Via ARM64 or AMD64

uname -m
#Download the file arm64 or amd64 or use the below command.
curl -LO <https://releases.hashicorp.com/terraform/1.12.1/terraform_1.12.1_darwin_arm64.zip>
(curl -LO <https://releases.hashicorp.com/terraform/><version>/terraform_<version>_<OS>_<arch>.zip)
cd Downloads && ls
unzip terraform_1.12.1_darwin_arm64.zip 
sudo mv terraform/usr/local/bin/
Enter password
terrafrom --version
Terraform [version] on darwin arm64

========
-L = Follow redirects
Tells curl to follow HTTP redirects (which HashiCorp's download URLs often use).
-O = Output to a file with the same name
 without -O You’d need to manually specify the filename:
Saves the downloaded file using the original filename from the URL — in this case, terraform_1.8.3_darwin_arm64.zip.
for a custome file name
-o expects a filename immediately after it

To uninstall terraform for AMD64 or ARM64

sudo rm /usr/local/bin/terraform
#OR the below command to remove entire directory
sudo rm -f /usr/local/bin/terraform
terraform --version

II. Creating a directory and .tf files.

#either in desktop or downlods make a directory 
ls
cd Downloads or Desktop
mkdir "Foldername"
touch provider.tf && touch main.tf

III. Creating S3 Buckets with Terraform

# In **provider.tf** file enter the following code
#Configure the aws provider
terraform {
  required_providers {
    aws = {
      source = "hashicorp/aws"
      version = "5.95.0"
    }
  }
}

provider "aws"{
region ="ap-northeast-1" #or one closest to you
access_key ="YOUR_ACCESS_KEY"
secret_key ="YOUR_SECRET_KEY"
}

Best practice : Don’t hardcode credentials directly into the code, instead use the export command.

export ACCESS_KEY = "your-access-key"
export SECRET_KEY = "your-secret-key"
#then run the following commands in the terminal
terrafrom init
terraform plan
terraform apply