Grats on jailbreaking your iDevice!
From what I understand altstore will prevent you from re jailbreaking your device every week (will not revoke checkra1n/unc0ver), you'll just need to occasionally refresh the app you are using to JB by tapping on the app in Altstore/opening altsore (the app will usually do it automatically).
Also altstore will help you install .ipa files (apps) without needing the help of a pc via cydia impactor (which doesn't work atm) or other similar programs, just install it in safari (if you find the app file you desire) and copy it to altstore and it will install it for you, that will only work for up to 10 apps iicr.
As for the tweaks, you can have as much as you want and as long as your device can handle it, you can get tweaks from cydia and sometimes you need repos to get other tweaks not available in the native cydia app.
If you want hacks from this site all you wanna do is download Filza first (cydia) and find the hack you want in this site, download it in safari and copy to filza, install the file you just copied and respring, then voila you have the hack.
If you have other questions, feel free.
*You download tweaks from cydia, if you can't find the tweak you want you might need a repo link, find the specific link you need and add it to cydia.
*tweaks are not apps.