QUOTE(Jusstatic @ Mar 27 2022, 11:36 PM)
May I know what is a bicycle computer? I am a complete noob to cycling here. Just starting out

It's just like Strava, except it's much more accurate. If you want to get even more detailed numbers on performance such as how fast you're pedaling & your power output, you'll have to install some physical sensors on your pedal & hub.
One of the reasons not to use your phone is to spare its battery for emergency purpose. Installing your phone on the handlebar can also invite snatch thieves.
Alternatively, you can also use your smartwatch if it comes with the ability to track your run / ride.
QUOTE(Jusstatic @ Mar 27 2022, 11:41 PM)
Completely noob question as I am very new to modern day bikes. May I know what sort of bicycle tool kit can I use to tighten my seat post screw?
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I might be wrong but I think you can get QR saddle clamp online to replace your existing saddle clamp.
QUOTE(Jusstatic @ Mar 27 2022, 11:41 PM)
Also, what sort of cycling app do you guys usually use to track distance and routes covered? I am just starting out, using Strava (seems to be the most recommended and famous app around) free version. Any other recommendation?

Strava is undoubtedly the most used tracking app these days. There are others like Relive, Ride with GPS, Komoot, etc but honestly it gets tedious if you install too many since they're more or less the same.
This post has been edited by talexeh: Mar 28 2022, 09:49 AM