u/DXK_music

I might be missing something here since I'm new to this but whenever I'm using the knife tool, I can never get it to cut exactly along guides I've placed. Why does the knife tool not snap to the guides like shapes do?
Whatever point on the guide I choose, from which I drag to cut my shape, is always either just above or just underneath the guide, but never exactly on the guide (see attached picture). Meaning my shape is not cut at the same height as other shapes that I want to have aligned.
How on earth do I do this?

Hi,

Very new to all this. I'm trying to remake and adjust an old logo of mine that an old friend of mine helped me digitalise years ago. It's not too complicated but I simply don't know how to do certain (basic) things, like cutting at angles and rounding edges.

Can someone explain to me how I can get the upper left corner to be cut off horizontally just like the center piece (red), and how I can cut that left "tail" at exactly 45 degrees like the 45 degree rectangle next to it (green)?
And how, after I've done that, I can round all corners/edges equally?
I'm on the newest free all-in-one version of Affinity.

Thanks!