using Contraints, you can have create restrictions on point and lines, point and points and lines and lines. You can make restrictions like length, radius, angle etc.
You can also make contraints function of each other, say that you already have a contraint d1, your second contraint after making it, for the dimension click the first dimension, the second contraint will become a function of d1.
Chamfer Tool
Essentially another style of fillet, you should normally always apply chamfer before fillet when using it.
For fillet and chamfer, you can press + and X on the side to add multiple of it.
Emboss from existing sketch
unlike the previous day where you emboss from text, you can make any geometric shape first and then emboss that shape onto your 3d object.
just make sure to ctrl if multiple face are used and untick tangent chain.