The first uses addthis.com resources to make the share buttons, but I didn’t work in my site. The second should be simpler, but the buttons don’t appear in my site.
Is it possible for you to ELI5 how to put share buttons in every post I wrote? I get I have to edit single.html and maybe some partials, but that’s it. I can’t go further than this.
As far as I can see you already have addthis sharing buttons on the bottom of your post, but in my opinion you should consider using cleaner way just like @alexandros say.
I suggest you to put the sharing button between the tag and disqus element in layouts/_default/single.html
This might be more involved than what you’re looking for, but here’s how I construct my social share buttons in a Hugo context. The code below is in a partial that I can drop into a single template. The SVG’s can any image you like.