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The knife tool is a modeling tool you can use to form new edge loops and vertices.

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To use it, simply go into the modeling workspace or go into edit mode.

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Then select the knife tool from the quick tools menu on the left.

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From there, you can either left click drag or tap left click to begin cutting into your mesh.

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You may notice at this time that there is still a purplish pinkish line attached to your cursor after drawing.

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To disengage this knife tool drawing mode, simply double left click or press E.

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This will then allow you to continue drawing if you so choose.

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However, I do warn you not to right click during this stage as it will cancel the cuts you have just made.

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To fully confirm the cuts you have made, simply press space bar or enter.

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As you can see, the visual style of the edge loops and vertices you have drawn have now matched the original mesh.

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This means they are fully applied.

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For further details about the knife tool, simply reference the bottom bar of the UI while you have the knife tool activated.

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Now, if you've ever wanted to cut anything in half, similar to a cross section, you would want to use the bisect tool, one of the knife tools sub tools.

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To use it, simply left click drag the knife tool in the quick tools menu on the left.

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This will open up a sub menu that includes bisect.

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Hover over the bisect option and release your left click.

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From here, you can simply draw a line or cut across your mesh.

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This will represent where you want to cut your mesh in half.

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Afterwards, a gizmo should appear that will allow you to adjust your cut.

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However, the most important settings are in the operator panel in the bottom left hand corner.

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Simply expand this and adjust the settings as you see fit.

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But most importantly, these checkboxes will allow you to fill the face that you cut open, as well as select which side of the cut you would like to keep.

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Both the knife tool and the bisect tool can be very helpful for editing your mesh.