I think it is important to understand what happens to the geometry when you mirror.
Scaling by -1 will mirror in the direction of whichever scale handle you grab, and can be one of the most straight forward ways of mirroring.
Plugins, Flip along etc are excellent, but just knowing the background is important.
Here’s a quicky where I use Copy, then scale -1 (which is a snap to amount), the Paste in Place.
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