 So I'm going to show how I use bookkeeping which sounds really really really boring and I've used this a lot in the last few years And I just want to show you how it can be cool and fun slight So why am I doing this my grandma told me to this is actually true my grandma said boy You should use bookkeeping to keep ahead of your finances and this is really useful And there's also a lot of questions that will pop up in our lives every once in a while that we can Comfortably and decisively answer with this so like I had a hundred euros a week ago and where is this gone how did it go away and Maybe you bought something that broke and you want to know how old it was So you can check it and you can know how much you paid for it So maybe you can do a calculation if you want to buy a new one or if you want to get it repaired Actually another thing that is useful is to keep track of how much you use on bandwidth Maybe you use your mobile phone a lot you use mobile internet So you may want to know which contract suits you And yeah, you can do comparisons of like the important things in life. How much do I spend on food? How much do I spend on hardware and should I change this balance slide? So what I use is came my money. This is just something I stumbled upon a couple years ago when I started this It's a very friendly looking nice client. These are not my figures I do not own hundreds of thousands of dollars, but maybe I can get there in time slide So how do I do it? I just record all the transactions this sounds really bad Like if I buy a sandwich at a railway station while traveling, do I record that? Yes, I do I do it for all my accounts. I do it for cash accounts, which is just my bag of money I do it for my checkings accounts and everything the resolution I chose is half a euro Which is convenient and if there's any you know sense left over. I just don't care I put them in a cookie jar so I can roll them up into these little, you know coin roll things. I really really love that You can do data validation by bank statements So you go to your bank every once in a while and you get your statement And you can cross check that actually came my money supports this as a native operation to cross check your stuff with the bank statement Which is really useful This does not take up a lot of my life I do five to ten minutes every one to three days depending on how much money I spend and Well the data that is accumulated is currently a hundred and seventy five kilobytes of G zip XML data And I've been doing this for five years. So that's actually okay. If you unzip it You can see how it's like two and a half megabytes of XML data Yeah, slight piece So this is some data. I uphiscated this. This is not the real data I changed the numbers of course and this is Israeli shekels because I find the sign is really funny But what we're getting into here is seeing how correlations of this data with what happens in your life is interesting like with these prominent dips I went on holidays big and expensive holidays and Yeah, you can see how things move the the light blue line is a moving three month average three month average The violet line is a moving six month average. So that's just you know playing around with I'm a physicist So I really love playing around with data and statistics and stuff slight and Yeah, as I said, you can see life events the red one is just miscellaneous entertainment like going to shows and stuff The yellow bars is alcohol spendings and the blue bars is cigarette spendings so you can see how I quit smoking and how that helps and You can see how my girlfriend broke up with me right here and Well, yeah, this was one hell of a New Year's party to So slight, please This is something for a more serious analysis. So how much am I using on a mobile phone contracts? You see how this is always a quarter of a year. So you see, you know, five five years gets to a lot of data I'm not even they love you. Just go you've got all right. Thank you So here it was a pretty expensive contract and then I switched it Which means that I used a lot less money on my mobile phone in the following months This has to do with a girlfriend again But now I started using mobile data So there's some cost-added and I'm I'm going to think of course I'm going to think about changing my contract so I can get this down a bit slight and now here's an important trick I want to show you in my last 30 seconds You are going to think that I cannot possibly track all my transactions I'm going to forget stuff and of course. Yes, you do and what I do to mitigate this is I just have a category called leakage so I thought of all the transactions I've tracked down like 30 euros and I'm just going to put five euros in I forgot this Okay, so you have a category for your own failures and it's not too bad You can just put it in this and it kept me going for five years