Go to the instances present under EC2 services on AWS

choose a name

Choose an OS image you want to launch on your instance

Create a new key pair and save it to your local

Under network setting leave all as default

Leave all the settings as default and click on launch instance

Congrats! You've created an instance

Go to the instances now and wait for your instance to start running

Click on instance ID and copy the public IPv4 address

Now open a terminal on your local and run the command

chmod 400 <Path-to-your-key-pair-file>

ssh -i <Path-to-your-key-pair-file> <OS-image-name>@<your-copied-public-IPv4-address>

congrats! you are now connected to the instance you have created on AWS