Edit the configuration

If ((Test-Path $Profile) -eq "True") {Notepad $Profile}

(create one)

New-Item -path $profile -type file -force

oh-my-posh (https://github.com/JanDeDobbeleer/oh-my-posh) is useful, together with posh-git.
in a nutshell:

Install-Module posh-git -Scope CurrentUser
Install-Module oh-my-posh -Scope CurrentUser

Add this to your profile to activate it:

# Import-Module posh-git
Import-Module oh-my-posh
# Set-Theme Paradox
# Speed up large repos
$GitPromptSettings.EnableFileStatus = $false

Some useful settings:

function f_timer($program) {
    $allArgs = $PsBoundParameters.Values + $args
    $sw = [Diagnostics.Stopwatch]::StartNew();
    iex "$allArgs";

Set-Alias which where
Set-Alias time f_timer