Currently the use of ‘of’ In ‘he could of done it’ wants to make me scream, but in time it may become recognised widely. I’m sure that some ignorant uneducated working class people in eg Manchester don’t know how wrong it is.
I hate the "could of" and "should of" instead of could've/should've. I tend to see a fair amount of Americans using it - particularly during Trump debates. :/
They're/There/Their also drives me nuts.
However I try not to be presumptive. I make allowances for dyslexia - although it tends to be a lot more common amongst the younger generation. I am also mindful that there may be older generations who never decent schooling. I always felt for dad who was not unintelligent, but really struggled with spelling.
My grandparents moved to a new area to set up a new business just after the war ended. Unfortunately my grandmother died a few years later, leaving g'dad alone to bring up young children and run a business with no family nearby. Dad never talked much about those days as I gather they were tough, but I know he said rationing was still in force and g'dad had leg injuries. Dad was the oldest and at the tender age of 12 had to do an awful lot to help run the business and look after his younger sister. He left school early and did most of the heavy work, so never really had any chance to gain a decent education.
I'm also a self admitted queen of typos - I've always joked I have dyslexic fingers. But I struggle even more these days when FM limits my vocabulary and I can't even recall certain words nvm type them - and that's on a day when my fingers aren't so swollen and sore to even be able to sit at the keyboard.
no one ‘goes online’
I suspect that is a generalised term that has come into being. Online means connected and to many people online, the www & the Internet are one and the same thing. As you say there is online banking, online auctions and even online help.
We have been talking about syntax and semantics for the most part, but there is a third vital aspect to language and unfortunately this isn’t taught to schoolchildren in my experience.
I don't believe it is. It probably went out of the window with the demise of Grammar schools
Whilst that may appear a pun - I suspect there is a lot of truth in that. I went to a brand new High School after the demise of the 11plus exam and I can't ever recall having such lessons.