Is there a way to get the information in this link (it's an index with all (?) the keywords) a and within the first level links in the command line with something like
You can access exactly the same documentation (including "clickable links") via
info bash -> select "Indexes" and then -> "Reserved Word Index".
Just for your information (in case you never used
info pages): search with
Ctrl-s, go up with
u and quit with
q, that should be enough for start;
info info will give you full description.