how to find a specificfile inside a folder in linux code example

Example 1: search for files in linux terminal

find /path/to/folder/ -iname *file_name_portion*

#Example
find / -iname *test*

#Output

/downloads/test_2.txt
/downloads/test_1.csv
/home/ubuntu/first_test.txt

Example 2: linux find file

# syntax 
# find *</path/to/dir> '(' *<Filter-1> *<and/or-operator> *<filter-2> ')'

# example 
find . '(' -name "Test*.pm" -a ! -name 'Useless*' ')'