You get over yourself and if necassary you give them your phone number. Using whatever app is personal preference and you can choose to say yes or no to using saidapp, but random strangers don't care enough to obsess over getting someone's contact into. That's what number block is for.
Anyone who thinks if a stranger gets their number that stranger will now stalk them, that person is a delusional narcissist.
Since you're asking, you're definitely not ready. Learn a projects formatting style for the code, work on open issue, submit patches, listen to all critiques and criticism.
Submit and the others will say when you're good. If you want to learn code correctness and proper security of code, study and go through OpenBSD's code. You could read the code for openNTPd and the code for OpenSSH, then move on to reading kernal code for OpenBSD.
I have been fulltime Molly on Graphene for over a year and a half, zero glitches or issues.
Molly on Graphene is the only way to live.
I assume from whatever is natively built into it, independent of anything else since system apps are disabled.
I have Webview disabled on both GrapheneOS and Android and Navi works without issue.
I've settled on Navi doenloader that has a built-in browser for websites combined with AdAway
Chromium is not an option and it never will be an option.
If you want to be strict about privacy, in F-Droid turn off all anti-features and you'll see there is no version of Firefox available to install. You have to make compromises if yo want to install any off-shoot of Firefox.
Navi download manager that has a built-in web browser combined with AdAway.
It seems like a very helpful service. I don't use cell data which means no GPS to contribute to it. I only use apps through wi-fi exclusively.
I think the only choice is Signal for practical purposes. There is no creating accounts, no scanning ID's, no invite link to chat. If they already know your number, there's nothing they need for you to contct you on Signal.
For people who I have their number, I will never ever acknowledge any other option than Signal because confused people don't end up making any choice. Only if they talk about servers and networks, then I will teach them network security. I say SimpleX F-Droid is king of them all, but for random people, I only mention Signal/Molly.
For the record, I will say that I am more willing to currently use Whatsapp than ever use Telegram. I can't speak to the cool features with Telegram because I hate it too much to register my number with them.