Katrin Eismann books on Photoshop are ok but a bit dated, you can probably find them online. The problem with Adobe CC is by the time a book is written it’s already out of date, so the best resources in my opinion are probably YouTube videos. Lynda.com/LinkedIn has a few bits, so does skillshare, probably good for a beginne but lacking in advanced skills. There’s loads on Udemy but it’s mostly absolute garbage so be careful, even if the course is on some sort of 90% sale it might not be worth it.
My advice would be to do a basic intro course, and then start editing, everytime you get stuck google the solution or watch a video on that topic.
One watchout with YouTube is the styles are all very samey and they will push you towards a certain look.
RawTherapee is really powerful, way more powerful than lightroom. It isn’t as quick, and is missing some of the more convenient tools like the perspective correction, masking and enhance features. If youre geeky you’ll appreciate the extra features it does have though, like choosing a demosaic algorithm or viewing your images without any WB applied.
Say no.
If you give them your raw files then they will essentially own your image and use it for whatever they want, edited how they want.
Provide Jpeg only, and with a maximum width of 2048px which is suitable for all social media.
Say you take these pictures for free, and a rider becomes famous, or dies, or in twenty years there’s an exhibition on the history of the sport - you want to be the person in control of those images.