G Suite is Google’s paid-for version of GMail. You can use your own domain name with it, so you can be firstname.lastname@example.org rather than something ending @gmail.com.
You log in exactly as you would with GMail. The process varies a bit depending on what you have been doing before. Start by going to the Google search page (for example http://google.co.uk) in a web browser, such as Chrome, Firefox, Safari, Edge, Internet Explorer or Opera.
The Google page will look like this (although on some days the “Google” lettering might look quite different, if Google is celebrating someone’s birthday etc). We’re interested in the bit at the top right, which I’ve circled in red:
If it looks like this (below), you are already logged in to GMail or G Suite (the little circle will contain your initials or a picture):
In this case, click on the circle, and either choose your account from the list or click on “Add Account”
If you click on “Add Account”, you will see this. Type in your G Suite email address:
Click “Next” to carry on logging in. You will be asked for a password (and in some situations a text message may be sent to your phone with a code you also have to type in).
If the bit at the top of the Google search page looked like this:
In this case, click on “Gmail”. You may be asked for your Google email address or you may be shown a list of addresses you have previously used, like this:
In this case, if the email address you want to use is not shown, just click on “use another account” and type in your G Suite address, as before:
It’s a lot simpler than it sounds!