I don't own a DSLR right now,; but I really want to learn photography. Please suggest me a camera I can purchase in 2020 with a budget of 50k to 90k

There are various options available at that price point as your budget is quite high.
Assuming you to be a beginner (as the question usually comes from someone who's getting started), you don't need to spend this much money.
As a begginer, it doesn't matter which camera you start with as you still don't know what they are capable of and how it'll be useful to you.
What you might find useful when getting started is the ability to get the photos transferred to your phone immediately.
This would help you analyze your photos, edit them on the phone using an app and post them on social media which is typically even many professionals do.
This is a cycle that'll keep you motivated to create amazing photos instead of falling prey to thinking that expensive cameras will fetch you high images.
Why you should buy a DSLR/ Mirrorless camera: currently these won't be your priority while getting started.
- Ability to take control of every aspect of a camera.
- Ability to change lenses.
- The ability the shoot RAW.
- Ability to mount Flash.
You can look at a DSLR or even a Mirrorless camera and here are options.
- Canon 1500 body with Kit lens & zoom lens: ₹35k on Flipkart
- Canon 77D ₹53,500 on amazon (yes I said 77D and not 80D as this is cheaper)
with Sigma 17-50 f/2.8 lens ₹30,000 on amazon. An approximate total of ₹85,000.
Memory cards, other accessories and lenses will be at an additional cost.
Ask yourself a question on what you plan to do with a camera on a longer run.
At this stage, you probably don't have an answer to this question.
Becoming good at photography is something that happens over time with a lot of practice.
Once you treat the camera as a tool, you can get great photos, even on a mobile phone.

Hardik has said it right. Think about what you wish to click. The logic here is Photography is an expensive hobby. If you buy the wrong camera and lens, you will have to adjust. For example, wildlife is done great with a telephoto lens. But if you're into portrait or event photography. Fast prime lens or 24-120mm kind of lens would be better.

I'd recommend going with D5600 or 70d kind of camera body.

Now comes the lens. You can choose to start with 50mm or get 18-55mm to start if you have no plans at all.

Learning Photography owning DSLR is always recommended. You can be a Good Pilot if you Own an Aircraft. Your skill and equipment make the best. Nikon Z50 is upcoming Mirrorless camera which has packed with a lot of features. But if you're looking for Dslr Invest on D3k series for beginners and buy many lenses. Or you can try D5k series which is an intermediate camera.