One thing every gardener needs is a planting schedule, and in the Northern Hemisphere, winter is the time to work on one. And what's cool about such a schedule is you only have to do it once. Then you copy it to next year's calendar, like I just copied mine
I finalized my regular planting schedual last year. Oh, I will still tweak it or add new items, but I think I've got the basic plan worked out after three years gardening in this new-to-me climate (USDA Zone 8.5 instead of Zone 5 - a huge difference!)
The easiest way to make a planting schedule is to check with your cooperatve extension service (USA) or agrigultural extension service (rest of the world.) They will have a list of planting times for various crops; I used the local planting schedule tables in my local cooperatve extension service's Clemson Master Gardener Handbook. You can also read the backs of seed packets, but they say unhelpful things like "plant two weeks after the last frost." How will you know each year if that is the last frost? Seriously. There's some guesswork involved. I mitigate that by using the extremely accuate Farmer's Almanac to guestimate the "last frost" for my area. The Farmer's Almanac bases weather predictions on sunspot patterns.
So my calendar now shows the planting window for various things. At one end I have three weeks to put in the onions and garlic next October, and a couple of week's leeway on when I put in the parsnips in November. Early peas can go in starting around February 15 with a two-week window to allow for a colder winter. Those are first this year. So on Feb. 14, I'll just bring up the 10-day lookahead forecast and see when that last frost will be.