I'm interested in the responses also, to get some more ideas. I use YNAB 4 but not the recommended categories. I use more logical (to me) categories, so I can use the Reports easily (how much I spent on food, transportation, etc. at the end of the month or year).
1. How do you budget your emergency fund and why do you do it that way?
I've been budgeting my EF as a line item under Rainy Day Funds where everything in the Rainy Day Funds adds up to the amount in my savings account. Other Rainy Day Funds include my trip to Maine, Christmas, my annual eye exam, contact lenses (bought throughout the year), and a general vacation fund.
I've customized the name categories to be most useful to me. For example, in the Rainy Day Fund I have:
3 Maine $500 ~ $50 ($200 funded so far)
(Purple is the full name of the fund, green is the amount in it.)
3 = this is my 3rd priority after the 1s (rent, utilities, cell phone) and 2s (groceries, Bart refill).
Maine = basic name of category, my Maine Trip
$500 = the goal
$50 = the amount I fund each month so I'll be able to go to Maine in June.
2. Do you save for big expenses in your categories? Why or why not?
Yes, in theory. I see that as the best benefit of budgeting. However in reality, when my SO wanted us to get furniture all at once and I could pay her back interest free over a couple of months, that happened.
Line items I do actually save for in advance would be things like Christmas, the Maine trip, my emergency fund, vacations, and anything else I'm eyeing for a while. I sometimes create categories and then delete them or just keep them on there to inspire me until I get to a point when I can fund them. New bike came and went - I decided my current one is good enough, rental down payment is on there but no funding as yet.
3. Net worth tracking
Reports lets me see Net worth for any time frame, and includes a graph I can play with. I used to track it through this forum also but haven't always kept up with it. I check it every month though.
4. Tips
Customizing YNAB is it's strength I think. I use the name categories and notes to plan and forecast a little. I can break down bigger goals that way and know when I'll achieve them. I can see that $500 is where I want to be and put in $50 in the name so I know how to get there. I can add notes to break things down further if I want, or plan a strategy (very helpful for me with Roth IRA planning). YNAB training had a bit of a "stay in the moment, don't forecast" lean to it. I think you can do both if you make use of the flexibility and tools of the name categories, notes, and calculator.