If you want to play DnD on FG, you'll have to find a group to play with first.
Fantasy Grounds creates the environment for a group of people to play DnD together at the same time.
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It is possible to play solo on FG https://www.fantasygrounds.com/forum...-for-FGU-INDEX and I believe that there are some solo modules available.
The videos are a wasteland
Lots of non wasteland videos here https://www.fantasygrounds.com/forum...sy-Grounds-VTT
But as LE says if you want more immediate advice hit me up on the official Discord and I can screen share stuff with you to get you going and help you get started.
The link to the Discord channel is here https://www.fantasygrounds.com/forum...Discord-Server
Thanks