D.B.
Thanks for your good wishes, M..
While I agree that, technically, Chanukah is not a major holiday because it doesn't appear in the Torah or Hebrew Bible, I think it's important to recognize that it has become a major holiday in the US for 2 reasons. One is not so good - because of its juxtaposition with Christmas, it has taken on the same commercialization that has beset Christmas (to the chagrin of many who celebrate either holiday). But the second is more important, especially in recent times and recent days: Chanukah affirms the right of all religions to exist and of all cultures to celebrate their customs within the greater society. Minority groups have every right to celebrate their language, observances, dress and other traditions, and the majority needs to be accepting of that. So Chanukah has become even more relevant in times when intolerance and misunderstanding are on the rise.
The only thing Jews really "have" to do during Chanukah is to light the special Chanukah menorah (called a Chanukiah) every night. We actually light quite a few - some we bought, some we got as gifts, some our child made over the years. We do them in the main window to share the light with the world.
All the other stuff is custom and varies by culture, region, etc. Most include foods cooked in oil (for the "miracle of the oil"). In my family, we follow the Ashkenazic traditions from central Europe mostly - potato latkes, although we expand that into sweet potato pancakes, and some mixed veggie pancakes. We also pick up some Sephardic traditions like jelly donuts as is common in Israel. We also share those chocolate foil-wrapped coins, called "gelt".
I always do some decorating with banners and Jewish star garlands - not as much as when our kid was little, but some.
We always keep the gift-giving small, with gifts on some nights but not all. I made an 8-pocket wall hanging for my son years ago, and each night definitely has something small - always a few chocolate gelt coins, and stuff like a pair of socks or a tee shirt. There were always just a couple of main gifts - and we would put a "clue" into one of the pockets about where our son should look for something too large to fit into the pockets. My son is an adult now but he still gets (and loves) his daily gelt, and I still give him undershirts or socks, plus usually 2 bigger things or books.
When my son was little and a picky eater, I bought the box of potato pancake mix and put those metal Chanukah cookie cutters in the frying pan of oil, then poured the latke mix in them - so he loved potato pancakes shaped like a Jewish star, a menorah and a dreidel.
We usually have at least one Chanukah party with Jewish and non-Jewish friends/family. It's a big Fry Fest with fried chicken tenders plus the various latke recipes, oven roasted vegetables (with a drizzle of olive oil), and maybe some of the shaped latkes if we have little kids coming. I'll make a batch of Chanukah cookies - just sugar cookies in the cookie cutter shapes with blue and yellow sugar stuff on top, plus jelly donut "munchkins".
We always have a charity project or night at least on one night. When our son was younger, we took money we had collected before every Sabbath dinner, and decided what to do with it. Sometimes we went to the supermarket and he bought food for the food pantry, other times we gave it in response to a local disaster (fire, etc.). One year I started a program at our JCC did a program to collect clothing and toys for 8 families in shelters - we got their wish lists, sizes, etc. and put them on 8 large paper "candles" we built in the building window. Families contributed to light the "flame" at the top of the candle when everything was collected. Now our synagogue participates in the Interfaith Hospitality Network, hosting homeless families - we feed, house and entertain them, help the kids with homework, babysit the little ones so the parents can get some quiet time or job hunt, etc.
Hope all enjoy this season of light and freedom!