Here is a selection of links to my favorite pages on the internet.
To check your website for broken links, you can use Link Checker: https://wummel.github.io/linkchecker/
Sketch Software to create movies like the one above. Totally free of charge for you. Peter
Images sizes for headers etc. https://sproutsocial.com/insights/social-media-image-sizes-guide/
Portable Apps helps add applications to your Windows PC without installing. I use it to have a number of browsers, my email and LibreOffice installed, all on an external drive. https://portableapps.com/