I plan it out depending on the trends. Usual expenses for personal hygiene, cooking, daily wear etc are subscriptions I make on Amazon and other places at a discount. Dad save a lot on time that way.
I buy clothes 3 times a year and in a burst. Early enough before people start buying clothes for the season and later enough to not have to get from the old stock. That way, price is cheaper and I have more freedom in selection. Sometimes old stock can have good stuff too that never gets out of fashion.
Electronics I go for a generation behind just before the launch and sale days when students are going to college/school. I have a few places I ask for opinions so I don't have to do the research myself. There are communities for that such as suggest a laptop, build pc, etc on many major platforms. Upgrade cycle is 4 years - near august or december.
I have booked flight tickets already for 2 upcoming trips at a really reasonable price. I try to book them months before with an additional payment for a zero cancellation upto 24 hours before. Even if I have to pay for that feature, it's not much of a cost compared to the cheap tickets I get.
Electricity, phone, internet, water etc bills are automated via local payment apps. I get points on payments made via the app as well as for using the credit card.
I use emi/credit wherever possible to avoid paying upfront. I had dad set those up on autodebt as well. Building that credit history.
I wish I lived in less remote area, I could have subscription based groceries too.
The biggest benefit I guess doing it like that is I can easily download reports, transactions and put them up for tax returns. I can also set expenditure on different cards and family members by default this way. Green those cards equally, haha.
As for the percentages, I would say food and daily essentials are the biggest, medical costs/insurance premiums/investments, electricity/internet/mobile/water bills, transportation and rent. The rest as I said before is preplanned and happens in burst on set months.
One rent equivalent each to clothing and health care (includes dental and eye care) annually.
One rent equivalent per year to gifts; 3 to charitable donations; 1-2 for vacations; 2 for misc expenses and larger luxuries.
For every dollar spent, roughly a dollar goes to savings and a dollar to taxes (high tax locale by US standards, low by broader developed country standards).