It might be quite hard to give full tutorials - I suppose it depends a little on what you’re trying to do - and are your titles intro sequences or other onscreen graphics etc?
The titler within Kdenlive is perfectly functional for static text/shape work, but you may find it easier to produce things externally - I certainly found myself producing the majority of titles in Inkscape - both onscreen graphics and intro pages etc. Basic stuff, i just put the full page in, faded in and out as appropriate. Kdenlive will take SVG and PNG, so you’ve got transparency for different layers of title component.
For bits with moving/sliding/fading components (like in an interview, a coloured bar slides onto the screen in the bottom left, then the person’s name fades in, then their position/workplace fades in, then it all fades out together) - I’d do those with individual components in Inkscape, imported as separate svg files and layered up in Kdenlive, then individually positioned, cut and faded in/out as separate clips (My timelines are normally 8-10 tracks high).
More complex motion graphic work I used to render out in Blender, but I think these days I’d probably use Natron for some of it.
Also, copy and paste as much as possible - work with reusable templates where you can.
If you’ve got a better idea of what sort of thing you’re aiming for (maybe an example of what you want to (re)create?) - I might be able to offer a few pointers at least :)