I know there are options of free security softwares out there that do good job like malwarebytes, but I really want to learn how to scan for possible threats of malicious files on your pc manually. I know you could check irregular and unfamiliar activities and processes on computer with process manager in windows, but I am worried that some malicious files could hide their processes or that they quit their processes when they have detected that you have opened process manager or security softwares such as malwarebytes or antivirus softwares. Is there a way to access a log of all the changes made and are being made to windows, recent and ongoing processes so one could narrow down suspicious files instead of having to keep surveilance on process manager all the time. And are there other ways to scan for threats in pc manually-- such as checking some system files. Also, could someone tell me how those security programs scan for threats themselves? And how do i know whether the scan method employed by them are thorough and trustworthy? And are security programs such as kaspersky, avg, sophos efficient in finding threats at all?
And usually how do you find ways to remove the threats? by Google alone? are there some online forums or communities where you could find people to ask for help fixing your infected pc, or some database for removal methods of malicious files? And if you cannot be certain what kind of malicious files your system has been infected with after googling and scanning with security softwares, where should you turn to for help?