FWIW, I have more than 1 browser installed ( actually there are 5 ) and each one is used for specific items.
This one is only used for work related things , another is for motorcycling , another for the hire cars & associated forums , one for tax , finance & government , one for general browsing.
All of them apart from the work one are set to clear the cashe & history at the end of every session ( it is in your prefferences ) .
When the pop up appear to "remember this password" hit NO and if like me you can not remember then , keep them in a book written in pencil so you can change them.
When ever you get asked for a name, date of birth & phone number, lie .
I use false addresses as well so for instance I might put in 102a my street in place of 102 so anything that comes addressed to 102a is rubbish & can go directly to the paper recycling bin which is right next to the letterbox.
Pay money for an email address rater than using one that charges you your identity.
Again if possible use a false name when you sign up.
Most paid for will be a package so for $ 40 a year, I get 10 email addresses and each one of these can have 3 aliases so that is 30 options.
Never use your real name as an email address so for work I use betsmobile@ which is the business name, for my friends I have my motorcycles pet name @ which my friends can associate with me but outsiders have no idea .
My government email address is gaolpoliticans@ and one of the financial ones is killuserers@.
This also protects you from dangerous emails because if I see some thing that looks like a genuine bank email addressed to me personally but in an account that I do not use for banking then I know it is spam of some sort and trash it without opening it .
Same story if I see the same email sent to more than one account .
Never link your actual phone to anything, particularly to you bank accounts, it does not make you any safer but provides a link for hackers between you and a phone.
Never put your phone number on any web site and if you have to ( for a business say ) then convert it into a picture format so a human can read it but web bots can not ( AI is making them better at that )
I also keep a second phone and use that number for government departments & financial institutions where the phone has to be real.
That phone is never used , it sits in a drawer and gets checked once a week or so to clear all of the spam.
I have a land line with no phone on it , just the server so when I need to sign in for covid contact tracing I use that number .
I also use it for a lot of other places that actually do not need to know my phone number .
All on line payments are done via paypal , never a credit card and that account is closed every year & I open a new one alternating between a credit card & a debit card .
Where ever possible, pay by cash , that way what you spend & where you spend it does not become public knowledge and if it is a big item , remember that all electronic payment systems charge the retailer up to 5 % ( down here ) so ask for a cash discount because they are not paying merchant fees.