how can I transfer pictures, contacts etc from my moto G ist gen if I buy Moto G 4th gen @repwireless-admin
If you have synchronized/backed up your contacts and photos to your Google account, then when you enter your Google account information on the new phone, they will be available on the new phone.
Text messages probably will require you to download an app to transfer your text messages.
Anyhow, it’s a good idea to always backup your photos and anything else you wish to keep, at least weekly, either on a separate computer or a cloud storage network like Google or Amazon. Phones do break or get lost.