Informational (options: S = show system objects, + = additional detail)
\d[S+] list tables, views, and sequences
\d[S+] NAME describe table, view, sequence, or index
\da[S] [PATTERN] list aggregates
\dA[+] [PATTERN] list access methods
\dAc[+] [AMPTRN [TYPEPTRN]] list operator classes
\dAf[+] [AMPTRN [TYPEPTRN]] list operator families
\dAo[+] [AMPTRN [OPFPTRN]] list operators of operator families
\dAp[+] [AMPTRN [OPFPTRN]] list support functions of operator families
\db[+] [PATTERN] list tablespaces
\dc[S+] [PATTERN] list conversions
\dC[+] [PATTERN] list casts
\dd[S] [PATTERN] show object descriptions not displayed elsewhere
\dD[S+] [PATTERN] list domains
\ddp [PATTERN] list default privileges
\dE[S+] [PATTERN] list foreign tables
\des[+] [PATTERN] list foreign servers
\det[+] [PATTERN] list foreign tables
\deu[+] [PATTERN] list user mappings
\dew[+] [PATTERN] list foreign-data wrappers
\df[anptw][S+] [FUNCPTRN [TYPEPTRN ...]]
list [only agg/normal/procedure/trigger/window] functions
\dF[+] [PATTERN] list text search configurations
\dFd[+] [PATTERN] list text search dictionaries
\dFp[+] [PATTERN] list text search parsers
\dFt[+] [PATTERN] list text search templates
\dg[S+] [PATTERN] list roles
\dv[S+] [PATTERN] list views
\dx[+] [PATTERN] list extensions
\dX [PATTERN] list extended statistics
\dy[+] [PATTERN] list event triggers
\l[+] [PATTERN] list databases
\sf[+] FUNCNAME show a function's definition
\sv[+] VIEWNAME show a view's definition
\z [PATTERN] same as \dp
Some of the commands that I use often (for quick testing/peeking)
Create a new database with name as
db_name
Connect to DB named
db_name
Show databases
Show tables [also called "relations"]