PhoDesPub

You may want to also check out the Stock Studio within Designer, as you can search for and add specific vector stock to your document from here -
2024-01-15 17-55-31.mp4  
I hope this helps

Many thanks for this tip. Finally, an integrated solution. This is how I imagined it. As in the past with two very well-known programmes, which also had countless such images available in a directory. 
Even if it's not the fine art of drawing. But it helps a lot to explain facts with a simple image composition and in a short time.
Super Affinity. 

There should be other image & vector third party sites which do offer such collections. Just make sure they offer certain collections in/as for Affinity apps reusable file formats (PNGs, PDF/SVG) and thus not only as EPS/AI files, as the latter by and for Illustrator created ones often won't be 1:1 reusable/importable for Affinity apps.
So just do an internet based search after such resources and materia ...

Also, I think the problem is that the question is a bit vague. Assets can be all sorts of things, in different formats etc and most people want them for a specific purpose or to use for things that they regularly use in multiple projects. To be honest, I've never come across any collections of Assets, specially designed for Affinity with, basically, a bit of everything in them! It's also worth keeping in mind that large numbers of Assets can take up a lot of space. so it's probably better to only add ones you actually need, rather than large collections, just in case you want them later. For occasional use it may be better to have folders with various items to use in your projects, rather than adding everything as Assets. 

It’s not stupid or incomprehensible, it’s just in the wrong place, where people might not be looking.
The Resources section of the forums is for people posting things for other people to use, rather than requests.
Questions are better asked, and answered, in one of the Questions sections of the forums.
A moderator will probably move this thread for you when they see it.

Happy Christmas to all Serif staff!  🥳
You all deserve a really great break for relaxation!
Jeff

Hi PhoDesPub
You can use the Perspective tool for this in Affinity Photo, check out the following tutorial using this tool! 
https://player.vimeo.com/video/147726737/

Hi PhoDesPub,
You can also switch to the Develop Persona (if you aren't there already which is the default workspace when you open a RAW file), go to the Lens tab on the right of the interface and use the Lens Correction's sliders to straighten up the lines/fix the distortion (on desktop) - check the rotation and vertical sliders. To help with the alignments you can also display the grid (menu View > Show Grid).
The iPad works in a similar fashion - Develop Persona, Lens section.

Oh, this works like a miracle. Thanks