You can easily do a table with a combination of HBoxContainer (rows, kinda) and VBoxContainer (columns, kinda). Or alternatively a GridContainer, which will wrap your Nodes to another row at the end of the row.
At the base of your table, put a PanelContainer node, and play around with its StyleBox panel setting in the Theme Override section. You can put a border, margins, background, etc.
As a child to that PanelContainer, put a GridContainer and change its columns property to whatever you need as a number of columns, e.g. 3.
Then, as children to the GridContainer, put Label nodes. Suggest to put at least double the amount of columns you set up to see how it wraps rows, and always make it a multiple of your columns number. You can then put some content into the Labels to see how it all behaves. Just make sure that your Labels are the same fixed size, otherwise they won’t align into a proper table. You can turn clip_text to true and set minimum_custom_size to make them properly fixed in size. You can change the label’s panel theme override properties too to have borders etc., so it looks like a proper table.
Using HBoxContainer and VBoxContainer would be a bit different, as you need to think in terms of rows and columns separately. I usually prefer doing it this way.
You also start with a PanelContainer to do some basic foundation, and then put one VBoxContainer as a child - no matter how many column you need, one VBoxContainer should be enough, unless you need some specific different behavior of some columns. Then, as a child to that, you put HBoxContainers in the amount of how many rows you need. In each of the HBoxContainers you put as many Label nodes as many you need columns. Ideally all should have the same amount of Labels. Each of these labels will serve as a column value for this specific row. Again, I would suggest to fix the size of the Labels, otherwise they might not align. And change the style of the labels to be more table-like.
Be sure to play around with container sizing properties - see how it behaves when you mark it as extend vertically, horizontally, shrink end, full rect, etc.
You can also play around with a ScrollContainer if your table gets bigger than the size of the screen - you just put it as a parent to your first GridContainer or VBoxContainer.
You can also think about using SplitContainer to make your column width or row height resizable like in Excel. But that’s a bit of a hassle right now, as with let’s say 15 columns you need to stack 14 SplitContainers on top of each other, and you need to synchronise them across your rows with signals. I would put that aside until much later if I were you 
Sorry I can’t put any screenshots or examples, but I’m writing this on mobile. Hope it makes some sense.
If you have any other specific questions - let me know.
I would highly suggest just sit and try it out on your own, you will learn it quicker than watching any tutorials.
DisplayServer.screen_set_orientation()
Check out the docs here: