2. Most likely, but you'll need to provide the system model number (Vostro 5558, etc.) for a definitive answer.  Adding RAM won't boost speed that much. 3.  Most likely, 2.5" SATA for a model from that period.  Again -- definitive answer requires the model number. 4.  No.  The earliest CPUs that are meet the requirements of Windows 11 are from 2018. For those applications, any Vostro system is going to be marginal at best.  You may want to investigate a more capable system with a better GPU and support for an NVMe SSD.  
Hi Everyone good day... I have a dell Vostro I am not sure what year this is But here are its specs as of the moment...   8GB RAM 256 SSD Win 10   1. How far will i be able to increase these two to improve performance of the laptop.  2. Is there a way to go up to 16GB Ram? 3. Can it Carry 1TB SSD and Will it function using SSD and HDD? 4. Is it compatible (in terms of performance) to Windows 11? I use it for 1. Canva 2. Photoshop (Sometimes) 3. Publisher (slow and lags)   I hope i get some answers I already asked in their messenger and when the cheeky little ... found its already OOW well it stopped replying... 
I NEED YOUR ADVISE on Upgrading my 2016 VOSTRO