How can i fix this dent and some cracks on the wall?
Hi @Calixta,
Welcome to the Bunnings Workshop community, it is wonderful to have you with us.
It is hard to tell the scale of the damage from your photo, but the method really depends on the size of the crack.
If it is not too big, you can use a plaster patch or mesh tape with some plaster filler to patch the damage. Check out https://www.bunnings.com.au/diy-advice/home-improvement/walls/how-to-patch-plaster for some guidance on the process and materials required.
If it is fairly large, lets say 20cm or longer, then you may need to use the method shown in https://www.bunnings.com.au/diy-advice/diy-skills/repairing/how-to-repair-a-large-hole-in-plasterboard , which utilises a plaster repair panel.
After fixing the damage using one of the above methods, you would sand the plaster smooth with a sanding sponge, prime the patch then paint it to match the colour of the wall.
Let me know what you think and if you have further questions, please don't hesitate to ask.
Jacob
