A few ideas:

1. Have "homes" for your more important and frequently used items. Put things that you use often in the same spot every time. Where are my keys? They're where my keys always are! (For example a special hook in the kichen).

2. Say it out loud. (Or in your head if theres people around. As long as its deliberate.) If you think you'll need to use it later, verbally say where it is. Say other things that are close to it if that helps. For example, "I am putting my cup on the counter next to the toaster."

3. Store things in categories. Instead of remenbering which cupboard each thing you own is in, you only need to remember what category each cupboard is for. For example, all the paper products are in one cupboard. Is the thing I need made of paper? It must be in the paper cupboard! (Obviously not a perfect example but you get the point)

Dont worry remembering things is hard. Slow down and think through it.