what function should i use to tidy up my code (extreme beginner)

[buran]

the keys of the dicts will be the player names or their nicknames,e .g. am (depending how you expect your user to provide the search term).
the values will be instances of class Player, e.g. with just first three players

class Player:
    def __init__(self, full_name, goals, shots, headers, tackles, passes, clean_sheets):
        self.nm = full_name
        self.gl = goals
        self.st = shots
        self.hd = headers
        self.tk = tackles
        self.ps = passes
        self.cs = clean_sheets
 
 
players = {'am':Player('Alfredo Morelos', 35, 10, 5, 5, 6, 10),
		   'rk':Player('Ryan Kent', 20, 10, 7, 5, 6, 8),
		   'jd':Player('Jermaine Defoe', 30, 6, 5, 5, 6, 8)}

then you can access them as with normal dict, using the key
You should know that everything in python is object. it doesn't matter if it is some built-in type or custom class - it can be value in a dict

If you don't plan to expand the class, built-in namedtuple from collections module would do just the same job.