Max RAM is 8G;  there's only one slot, so if you now have 4G, you can replace it with an 8. SSD:  2.5" only, and only one of them so you'd need to replace the hard drive with a 2.5" SSD.  
Good day. I just want to ask if I can upgrade from hdd to ssd and upgrade the ram too? Thanks
INSPIRON 15 3573 - hard drive and ram modification