1.With using parameter we can give only one value ,

Using range we can give range values (i.e, lower value and
higher value .

2.

3.

4.in support project most of the cases requirement will be 

like changes in the case of implementation we will be
getting end to end objects and the configuration part will
be from start to end

1.Difference between Parameter & Ranges :
Ranges :it gives 2 values ie) fromvalue and tovalue.we can 
use select-options also ranges.It creates 4 selection table
(sign,option,low,high).
parameters do not create selection table and it shows only 
1 value.with paramters we can define checkboxes and 
radiobuttons.

2.Methodology: project preparation(as-is,to be),business 
blueprint,realization,final preparation and go-live.

3.system symbol is the standard symbol used in r/3 for 
defining date time,month etc.

4.support project: makes changes or configurations after 
implementation projects by means of raising tickets .
implementation projects : doing end-end implementation 
projects ie)covering all phases in methodology.implementing 
SAP from conventional system.