Answer me as if i am clueless please 
i have been a long time used of lastpass i have no problems with it, and its free, in my chrome browser i have the extension and it auto fills or auto stores the required fields for me. My passwords are bad am 61 and cannot remember them all, however they are only passwords to forums etc, so no great loss there.
I want to start using keepassxc and store the database on my home nas (synology) dj218+ am i correct in assuming with keepassxc for it to run it has to be open as such on my desktop, unlike lastpass where i just have an extension. Kp has an extension but as soon as i closed the main program this became disabled, i guess that's the security of it. So if i want to login into a forum or whatever i "have to 1st open" keepassxc
If anyone could link me some good tutorials or tips on how to set this securely i would be really grateful
thanks

i have been a long time used of lastpass i have no problems with it, and its free, in my chrome browser i have the extension and it auto fills or auto stores the required fields for me. My passwords are bad am 61 and cannot remember them all, however they are only passwords to forums etc, so no great loss there.
I want to start using keepassxc and store the database on my home nas (synology) dj218+ am i correct in assuming with keepassxc for it to run it has to be open as such on my desktop, unlike lastpass where i just have an extension. Kp has an extension but as soon as i closed the main program this became disabled, i guess that's the security of it. So if i want to login into a forum or whatever i "have to 1st open" keepassxc
If anyone could link me some good tutorials or tips on how to set this securely i would be really grateful
thanks