The important thing to remember is that a great many people who use the internet or computer software never had any form of training at all. I am in my mid-50s and when I was at school or university there was no internet, no personal computers, no mobile phones at all never mind smartphones (not even televison until I was 15). I have never had a day's training in my life any of these things. The closest I came was when in one of my first jobs,a kind secretary showed me how to use an electronic typewriter (back in the late 1980s!).
I just learned how to use it all just going along and practicing over the years (and these days looking things up on YouTube when I need to!). I run a business and a professional practice completely online these days. I do everything on the internet including running a personal blog, keeping my accounts etd etc. Some fails ocur at times, like in anything, but that doesn't matter. Practice repeatedly (very important, this) at things at times when you are not under pressure , and you can do it! It really does not need any formal training, you need to stop worrying about that, but you have to put in some time and try to enjoy it.
What version of Word or any other software you may have trained in doesn't matter, I have never trained in any version of anything, I have just spent hours and hours poking around in programmes and on sites trying things out and going "ah!" when I at last figure out how to work the features!
Software and website designers these days really do make everything as user-friendly and intuitive as they possibly can, if they didn't they would lose business. Remember: they are always trying to make it as easy for YOU as possible, not put barriers in your way. You just have to play around with it. You can do it!
Maybe try some child-centred sites and apps? These tend to be really easy to use and get you going to start as you build confidence. Honestly, if you can work a TV remote control you can work most of these apps....