i want to know that do we need to buy the assets in game salad or they are free and easily available.
A false dichotomy if ever I saw one
Most people make their own assets, but you can use any source you like, bought or free.
Assets in the GS market place are for sale from GS. Other third party sites you can purchase from and ALSO some free assets include
DBA @DeepBlueApps www.deepblueapps.com
GS helper @uptimistik @Braydon_SFX
GS Invention @CodeMonster @timolapre1998
Free image Stock @openstockproject www.openstockproject.com
I am not affiliated to any of these sites before mods delete the links. However I have tagged all owners of the sites so you can contact the site owners if the mods move in and remove links. It's a sad time at the moment with outside links. Hope this helps you find what your looking for @HKQ
Also if you fancy a GS master class by @domenius then the link is in my signature.
GAMESALAD DEV FOR HIRE! - www.gingagaming.com