I occasionally connect wires to terminals, but - I've never used ferrules: I just self-twist the thin strands, push the thing in, and use the lever or tightening screw depending on the terminal's mechanism.
Why would I use a ferrule? Or perhaps, under what circumstances is that advised?
PS - Link to the ferrules they mentioned: https://www.amazon.com/gp/product/B07R6QQ7MW/
Ferrules also evenly distribute the clamping force and prevent crushing of the strands.
Ferrules solve the problem of having to align the threads every time you re-post them in a terminal block.