What must be done, step by step, a week or more to free up space and keep a computer running in top

I know that there are a few things that need doing to a computer on a regular basis to free up, for one, disc space and other things so that it keeps it running in tip top shape and stops it from getting bogged down, slow, etc. I've been told these are quick, easy steps to keep a computer 'clean', in 'as new' condition. I've never been able to get these various steps laid out clearly for me to do step by step. It seams everyone expects you to be techy and are impatient to spell things out since many people today think these are things everyone knows or should know. It's got more and more embarrassing to ask. I've even taken my laptop in and piad to have it done, but I really can't afford this and when I ask to get it spelled out, I'm told like "defrag once a week" as my eyes glass over and it becomes clear they think I know how to defrag. I don't even know what degraf is! I'm disabled it's hard. I need it spelled out. as in 1a. b. c. I don't mean virus protection or scaning. Thank you

What must be done, step by step, a week or more to free up space and keep a computer running in top condition?antivirus downloads

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