Dark mode is important so people with sensitive eyes don't get eyestrain from navigating a website. Light mode is important so people whose eyes don't take in much light can clearly see a website. It's not a question of which is better; ideally, you should have both.
If you don't have the time or resources to design an entire nice-looking alternate color scheme for your website, you can use automated tools to make a dark color scheme; it doesn't have to be perfect, I appreciate any kind of dark mode because they're easy on my eyes. UserWay is one that I see many websites using, and it works well.
Figma is great for designing user interfaces. This is mainly because of its excellent auto-alignment features, which aren't instrusive and are great at guessing what I want. For example, if you copy and immediately paste an object, the copy will be in the same place as the original; if you copy an object in one frame, then click another frame of the same size and paste, the position of the copy will be equivalent to the position of the original on its frame; etc.
I love web apps because they can run on any computer and any browser. Figma is a webapp.
The Google Office Suite is useful for many use cases. You can quickly and easily make presentations with Google Slides. You can write papers with Google Docs.
There doesn't seem to be a landing page for learning about the suite, so I'll link to Wikipedia's article on Google Docs Editors. It should have a landing page; a good landing page can quickly give someone an overview of a product.
I don't use LibreOffice too much, because I usually reach for the Google Office Suite. However, Google doesn't have an alternative to MS Access. I was happy to see that LibreOffice has an alternative to MS Access. I hope you find LibreOffice Base to be useful.
I've heard that some companies host their videos on Vimeo rather than YouTube because they feel that YouTube's interface isn't a good fit with their branding. Unfortunately, Vimeo has a tendency to disconnect and be unstable.
Sendvid is a simple, free video host that I've heard of. I haven't used it yet, but I have used their other service Imgbox (an image hosting website) which I've found reliable and useful.
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