Scott Dikker's deliberately simple, height-of-1990 Jim's Journal is alive and well at Go Comics.
The current series seems to be a mix of old and new, including Sunday issues in color. To understand them, start at the beginning and let the "power" of the narrative accumulate.
Yesterday's comic blew my mind. Unusually, Jim doesn't appear, but perhaps because it is a standalone it will work for newcomers.
I'm impressed with how well Jim's Journal holds up in our hyper-ironic culture. Back in the day, when this kind of dry irony was new, Jim's observations were subversive. Now, many of those observations seem full of heart.