ReachDeck’s scanning and reporting tools are designed to help identify compliance and content issues on your website. ReachDeck cannot fix compliance issues. You should discuss compliance issues with your organisation’s website team to agree an appropriate action plan.
For information on WCAG, see the W3C website
You may also find the W3C Understanding WCAG information useful.
WebAim publish a very good guide to WCAG which can be useful for non-technical readers.
You can see a list of all the WCAG clauses checked by ReachDeck.