Updated PHP from 5.6 to 7.4. WordPress version currently on 6.03, it says there is an update available but when I try to back up the site says there is an issue with the plugins. No expert in WordPress just learning as I go. Can no longer make changes to website. Are the 2 issues linked? Help!
PHP 5.6 to 7.4 is a big jump, there must be obvious issues. there is no short term solution to this, you will have to revert the changes on live site to get it back up.
In order to update version, you will need to
create a staging site .
update the versions and fix any issues on staging site.
then implement the changes on live.
Try turning on debugging and see what caused the error. may b its a plugin clash or a theme clash.