Difference between Convenient and Useful

CONVENIENT vs USEFUL: ADJECTIVE

Of great importance or use or service
Capable of being turned to use or account
Being of use or service
Having a useful function
Having a beneficial use; serviceable.
Being of practical use.
Full of use, advantage, or profit; producing, or having power to produce, good; serviceable for any end or object; helpful toward advancing any purpose; beneficial; profitable; advantageous.
Having a practical or beneficial use.

Fit; suitable; proper; becoming: used absolutely or with to or for.
Affording certain facilities or accommodation; commodious; serviceable; rendering some act or movement easy of performance or freeing it from obstruction: as, a very convenient staircase; a convenient harbor.
Opportune; favorable: as, a convenient hour.
At hand; easily accessible; readily obtained or found when wanted; handy.

Useful invention.
Being of use, advantage, or profit; valuable for use; suited or adapted to a purpose; producing or having power to produce good; beneficial; profitable; serviceable.

Advantageous, Expedient, Affordable, Easy, Inconvenient, Convenience, Ready to hand, Favourable, Favorable, Opportune, Commodious, Spacious, Roomy, Handy, Accessible

Recyclable, Multipurpose, Reusable, Reclaimable, Utilizable, Utile, Utilitarian, Serviceable, Functional, Useable, Usable, Practical, Important, Valuable, Helpful

Advantageous, Expedient, Affordable, Easy, Inconvenient, Convenience, Ready to hand, Favourable, Favorable, Opportune, Commodious, Spacious, Roomy, Handy, Accessible

Recyclable, Multipurpose, Reusable, Reclaimable, Utilizable, Utile, Utilitarian, Serviceable, Functional, Useable, Usable, Practical, Important, Valuable, Helpful

Online reservation booking is safe, secure and convenient.
FHA loans are highly convenient in some situations.
They can be easy and convenient to use.
Portable, convenient and does not need much space.
Dumplings are both cheap and convenient to eat.
Use of QR Code is a convenient way.
Come home to convenient living at Royale Apartments.
Paying premium online is the most convenient option.
Simple and Convenient for Crypto Projects IEOs prove to be more convenient for crypto project developers.
The cheap, convenient and public nature of social media platforms means they are a convenient way for shoppers to register their concerns.

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This option is only useful to Guix developers.
Three additional categories of area formulas are useful.
They identify the useful energy forms and the desired output of the device, and the forms that are not useful for the intended use.
Useful Summation Formulas We can use the notation to indicate useful formulas that we will have occasion to use.
This is useful for maintaining correct release times for software and is particularly useful in conjunction with the MKS Make software development facility.
As always, if you find this article useful then others may find it useful too.
The guide is quite useful, and has useful pictures accompanying the text.
Gems of Useful Knowledge Life hacks, practical tips and overall useful information.
Please provide examples of how they are useful or not useful.