Question about getting a bike?

You buy a bike for how and where you will ride. For short rid3s on flat ground a single speed bike   / cruiser will do. For rides in an area with terrain, a hybrid will be a great choice. For steep terrains on soil, sod, and rougher roads... a mountain bike. For long, fast rides on streets, paths, and pavement... a drop bar ‘racer’ might be the best choice.

Soccerref

BikesDirect Sells "enthusiast level" bikes, which is somewhere between Chinese Wallmart junk and "professional" bikes. The site has a sizing calculator so that you get a reasonable chance of a proper fit.

I will say that if you're not going to buy a bike at a bike shop, don't waste their time getting fittings and test rides while dangling the possibility of a sale in front of them. That's just inconsiderate.

Here's a frame proportions calculator that can let you know the general area you need in a bicycle frame for your particular body build. 

https://www.competitivecyclist.com/Store/catalog/f...

Which there isn't anyway you can measure the tubes online.  Go to a reputable bicycle shop for a proper fitting. 

Bog standard advice is to visit at least one specialist bike shop and test ride at least 3 bikes. This is especially important for new riders who aren't sure what size and style they need. In the UK most bike shops are still open and you don't have to buy from them if there are better deals online, though many shops will proce match and you needan actual shop for servicing and repairs.

I saw under comments you're 5' 8" tall.  So?  Most bikes sold online only have one frame size.  It could be right - it could be wrong.  And even if they do offer different frame sizes, not all people 5' 8" tall have the same proportions.  Some people have longer legs & a short torso.  Others, just the opposite.  Unless you can physically test ride a bike before the sale, you'll never know for sure.  

A prime example of this is my old 2010 Raleigh Clubman rated at a 55cm frame size.  Fits me like a glove.  One day I decided to test ride a Fuji road bike.  Know what size fit me the best?  A 52cm frame!  Same thing with hybrid bikes.  Raleigh rates a 19" frame size hybrid as 'medium' while Fuji says their 17" is a medium.  

Unless you know precisely how to read frame geometry charts, stick with one from a bike shop.  You'll also get a local 'service warranty' good for a free follow up tune-up on the bike as it settles in.   

Rule #1 when choosing a bicycle: No test ride - No $ALE.  How ya gonna do that over the internet?  What one company describes as a 'medium' frame size may actual be a 'large' from another.  And once you sign for that box...it's yours!  Good - bad or indifferent - YOU OWN IT.  And read the fine print.  If NOT assembled by a certified mechanic, you have NO warranty.  

On the other hand, bike shops have been determined to be a 'necessity' even through this Coronavirus pandemic.  THEY'RE OPEN.  Or at least most of them are.  

You'll have to give a better description other than "a simple bike that will last and wont drain my bank account."  I'm not privy to your bank account or credit card info.  Is your neighborhood out in the country, suburbs or inner city?  Is it flat, hilly or somewhere in between?  Buy what you NEED.  For mostly off road riding, get a MTB.  For riding fast on smooth paved surfaces, get a road bike.  A great "all-around" type bike is a hybrid.  Some call them 'fitness bikes'.  Here's one that if taken care of properly will last a LIFETIME.  http://www.fujibikes.com/usa/bikes/pavement/fitnes...           

Get one the right size for your height. That's very important. Seats are adjustable up and down so that can be altered. Pricier ones are lighter weight, which is nice.