Board Game Arena

Apologies if this is clear to you, or if there is a topic on it already - I'm quite new to this app/site.

Underneath each player's name, there are some numbers and symbols:

What do the symbols underneath the numbers mean ? I think the black and white shield refers to each player's longest road.
What about the rest ? The ones on the right with the road, settlement and city signs are telling you how many more you can use of each.

Your input is appreciated.
Thank you

From left to right, it's the number of resource cards the player has, the number of development cards they have in their hand, the count for longest road (it turns green if they have the longest road and associated 2 point bonus), and the count for the largest army (similarly turns green)

On the main catan page there is a video. How to play catan. You should watch it:

https://boardgamearena.com/gamepanel?game=catan

Video is on the right, half way down.

Thank you for your replies. That will help me understand the overall picture.