Unity 2D Tower Defense - Problem with towers

Unity Engine
1

Hello, I am quite new to Unity and programming in general. I am currently making a final school project which is 2D Tower Defense in Unity. I need some help regarding the towers.
Currently I have the tilemap and movement of enemies. Enemies are gradually spawning and they are following waypoints. The problem is that I don’t know how to place towers (ingame) and make the towers shoot at enemies and deal damage to them. I would be very happy to receive some help because my deadline is near.

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2

There are a lot of videos on this, here is a full course you can pick through and find the parts you need:

3

Ye I know about this video, the problem is that it is in 3D.

4

The concept is generally the same, you should be able to convert it to 2D relatively easily after watching. Or, just Youtube another 2D Tower Defense, there are so many out there