help with meta titel and meta Description

Hello

when I try to edit a category I have alot of option can you eplain them

fore example I want to edit the category Motor->Cars

Heading (H1) :
what should I write in this box?
(sell cars in UK)

Title :
can I just use the same as (sell cars in UK)

Description:
why is write in html code

Meta description:
this description will show in google
can I just write same as meta description

Meta keywords:
what should I write here
I write [sell cars,UK,BMW,ATOZ]
is this right

Listing meta description:
this is what show when shared
I ad {price}{condition}{buld} when I shar an AD it show like this
70000 pondnew2010
so I write like this Price:{price}\ Condition:{condition}\ buld:{buld}
it show like this Price:70000 pond\Condition:New\ buld:2010
when some fiel is empty it show like the Price:70000 pond\Condition:\ buld:
how can I make it lile this
Price:70000 pond
Condition:New
buld:2010

Listing meta keywords:
I write like this {title}{Category_ID} UK

Listing meta title:
I write like this {title} {buld}

Automic post pattern:
same as the meta discretion

pleas help