I just go into notes app or pen and paper of choice nothing too fancy
Also take this with a grain of salt as while I’m still living with my parents and don’t really pay
In one section I have subscriptions that cannot exceed like $35 a month and that’s more a list that rarely gets updated
Then as for month to month expenses I divide into money to spend on games and toys/treats for my dogs and taking out the gf and gas and an other category and I allocate money towards those categories
I do it so I don’t over spend in one section like blow all my money on my dogs then have no money to spend for my girlfriend or something
Each month when I “refresh” my monthly budget any unspent money (and minus some to put into savings) rolls over to next months budget
It works wonders and I can move money for spending around easy since it’s all visual