sudo apt install samba or sudo dnf install samba, then sudo vim /etc/samba/smb.conf, and specify something like this:

# See smb.conf.example for a more detailed config file or
# read the smb.conf manpage.
# Run 'testparm' to verify the config is correct after
# you modified it.
#
# Note:
# SMB1 is disabled by default. This means clients without support for SMB2 or
# SMB3 are no longer able to connect to smbd (by default).

[global]
    workgroup = WORKGROUP
    security = user
    passdb backend = tdbsam
    log file = /var/log/samba/%m.log
    log level = 3

# samba doesnt use system passwords, but uses system users, so
# for a user we need to create "samba password" using
# sudo smbpasswd -a username

[testshare]
    path = /home/john/testshare
    read only = no
    browsable = yes
    force user = john
    writeable = yes
    public = yes
    valid users = john
    #directory mask = 2775
    #create mask = 0664
    #force create mode = 0664
    #force directory mode = 2775
    comment = test

then sudo smbpasswrd -a myusername, specify some password.

Finally, add samba to firewall exceptions. For example, on Fedora,

sudo firewall-cmd --permanent --add-service=samba
sudo firewall-cmd --reload

or

sudo ufw allow samba

and

sudo service smb restart

if on Fedora, when sharing a directory from home folder, we must allow this action, so SELinux doesn't block requests from samba:

setsebool -P samba_enable_home_dirs on

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