I just use a moleskin classic notebook [1] with a Schneider Topliner 967[2] in black, blue and red.

Everyday I put on my tasks, and notes.

Easy simple, classy :)

[1] - https://www.moleskine.com/en-us/shop/notebooks/the-original-...

[2] - https://schneiderpen.com/en_ng/fineliners-and-fibrepens/topl...