Please advise me how update my computer

If you buy the cheapest motherboard or the cheapest Ryzen 3 CPU you won't have a good time.
i3-4150 is a dead end since it's a dual core, so you need to upgrade, and the difference in performance will be huge.

Upgrading to a newer platform also requires buying DDR4 RAM, so that's some extra cost for you.

Decent 4 core Ryzen CPUs will be Zen 3 which don't exist yet.
You could get i3-10100 but the price is too high and the 10400F / 10400 is just slightly above in price. At that price range, you can also buy a Ryzen CPU around R5 3600.

Either way, get at least 8GB of RAM, don't cheap out there as well, get at least 3200MHz sticks (you can manually tweak RAM timings afterwards if you want to squeeze more performance there), ideally you'd want 2x8GB so you can get dual channel memory for increased performance. 2x4GB is also a thing if you really can't afford 16G of RAM.