#Tips
AudioFX - Audio enhancement
Provides classes that manage audio effects implemented in the media framework.

So there's one interesting app in LineageOS called AudioFX, which is a sort of an audio enhancement app, so let's check out what it has to offer.

There are a total of 11 presets, those are: Normal, Classical, Dance, Flat, Folk, Heavy metal, Hip Hop, Jazz, Pop, Rock, Small speakers. When you long hold on any of the bars, it will switch you to the custom mode and over there you can customise it however you want. You can also add more if needed by pressing the "+" button on the top-right corner.

At the bottom, there are Bass and Virtualiser which are only available if you have a headphone connected. By the way, you can switch the audio source on the top-right corner. That's pretty much it for this app, most importantly it's open source and free to use.

#Tips
Contacts - People that you know
A facility allowing to store details of personal contacts.

You could have possibly contacted many people, and the Contacts app is here to help you sort out all of these messes. There is not much to play with, when first opening the app you will see all of your contacts with a "+" button on the bottom-right corner. Tapping on it will let you create a new contact. With 19.1, it is also possible to add dates and relations too.

The hamburger menu has My Info, Contacts, Label, Accounts, Emergency Info and Settings option. In the settings page, you can manage accounts on the device, set the default account for new contacts, contacts to display when opening the app, change sort by, name format and phonetic name. You can also import and export contacts from there.

Besides, there are widgets which let you open the contact info page, direct dial and direct message, which will open the default phone and SMS app respectively.