Slicing things (eggplant, bread, etc.) evenly

I use this: https://www.webstaurantstore.com/victorinox-45960-precise-slicer-8-1-4-serrated-slicer-knife-right-handed-design-with-adjustable-guide/35345960.html?utm_source=Google&utm_medium=cpc&utm_campaign=GoogleShopping&gclid=Cj0KCQjw_o7NBRDgARIsAKvAgt1bnVk-liBamZBIilBBlFoQp7Rah3WSyHOwkq0wFenRwadywQ3VStoaArV6EALw_wcB
Its very sharp and the width of the cut is adjustable. The 'fence' on the right makes the very bottom of the bread a little awkward to slice, but you soon develop the wrist motion it needs. It is also marketed under the name Magna Food Slicer. It slices very consistently and is much safer than a mandoline.

I use a mandolin as Pierino suggested for veggies. For Bread I like a long serrated knife, a short knife will just shred the bread. If you want perfect slices, put a piece of masking tape along the edge of the cutting board and mark off the slice thickness with a ruler, line up the bread and slice or buy this... https://www.amazon.com/Bread-Pal-Slicer-Maple-Birch/dp/B005YCKRMU?tag

I would say " practice makes perfect" but that's annoying lol.

There are mandolins that cut food evenly, however they are rather dangerous to use. The guards can slip It's very easy to get a deep cut. So use caution, and maybe a chainmail glove.

there are cutting boards with dimensions printed on them. That way you can visually see what a 1/4" slice looks like.

Also having a sharp knife that fits comfortably in your hand and a cutting surface that is at a comfortable height for your stature helps.

I also put a damp cloth under my board so nothing slips around.

You can also cut the item so there is a flat edge, nothing more challenging and dangerous then chasing wobbly veg around the board.

I would also suggest going to a high end kitchen store and having them teach you proper grips and technique. I would say that having proper technique will make the biggest difference.

Sorry for the long answer, Hope it helps! Good luck and keep those fingers curled so avoid an accident

Grocery store bakeries will slice whole loafs for you. What most important in slicing is uding the right knife and a well-sharpened knife,