apt command compared to apt-get has a few advantages: coloring and progress bar when you install or update a package.
One downside of using apt command is the partial support of tab completion, which apt-get has mastered it. And I know that tab completion is very usefull.
In terms of functionality, it's almost the same as apt-get command. Even the commands are very similar.
1. Update repositories with apt:
sudo apt update
2. List upgradable packages:
sudo apt list --upgradable
3. Install/update a package:
sudo apt install wget
4. Remove a package:
sudo apt remove vim
For more informations read the apt command manual: