I like to add as many repos as I can.
The more apps in F-Droid,
the less reason to go to GooglePlay :)

Here is a list with all repo's I've got imported:

• https://microg.org/fdroid/repo?fingerprint=9bd06727e62796c0130eb6dab39b73157451582cbd138e86c468acc395d14165
• https://microg.org/fdroid/archive?fingerprint=9bd06727e62796c0130eb6dab39b73157451582cbd138e86c468acc395d14165
• https://f-droid.org/archive?fingerprint=43238d512c1e5eb2d6569f4a3afbf5523418b82e0a3ed1552770abb9a9c9ccab
• https://f-droid.org/repo?fingerprint=43238d512c1e5eb2d6569f4a3afbf5523418b82e0a3ed1552770abb9a9c9ccab
• https://guardianproject.info/fdroid/archive?fingerprint=b7c2eefd8dac7806af67dfcd92eb18126bc08312a7f2d6f3862e46013c7a6135
• https://guardianproject.info/fdroid/repo?fingerprint=b7c2eefd8dac7806af67dfcd92eb18126bc08312a7f2d6f3862e46013c7a6135
• https://anonymousmessenger.ly/fdroid/repo?fingerprint=e065f74b35c920c7713012f45a0c8ad4758dd2776cff6214f7d8064b285c044b
• https://fdroid.beocode.eu/fdroid/repo?fingerprint=28360ddeba00922b156a9b03b5c96fea39d239f88f1fbfa5a8157291749aa05a
• https://mobileapp.bitwarden.com/fdroid/repo?fingerprint=bc54ea6fd1cd5175bcccc47c561c5726e1c3ed7e686b6db4b18bac843a3efe6c
• https://briarproject.org/fdroid/repo?fingerprint=1fb874bee7276d28ecb2c9b06e8a122ec4bcb4008161436ce474c257cbf49bd6
• https://fdroid.bromite.org/fdroid/repo?fingerprint=e1ee5cd076d7b0dc84cb2b45fb78b86df2eb39a3b6c56ba3dc292a5e0c3b9504
• https://www.collaboraoffice.com/downloads/fdroid/repo?fingerprint=573258c84e149b5f4d9299e7434b2b69a8410372921d4ae586ba91ec767892cc
• https://static.cryptomator.org/android/fdroid/repo?fingerprint=f7c3ec3b0d588d3cb52983e9eb1a7421c93d4339a286398e71d7b651e8d8ecdd
• https://divestos.org/apks/official/fdroid/repo?fingerprint=e4be8d6abfa4d9d4feef03cdda7ff62a73fd64b75566f6dd4e5e577550be8467
• https://fdroid.fedilab.app/repo?fingerprint=11f0a69910a4280e2cd3ccc3146337d006be539b18e1a9feace15ff757a94feb
• https://fdroid.frostnerd.com/fdroid/repo?fingerprint=74bb580f263ec89e15c207298dec861b5069517550fe0f1d852f16fa611d2d26
• https://gitjournal.io/fdroid/repo?fingerprint=e2ee4aa4380f0d3b3cf81eb17f5e48f827c3aa77122d9ad330cc441650894574
• https://apt.izzysoft.de/fdroid/repo?fingerprint=3bf0d6abfeae2f401707b6d966be743bf0eee49c2561b9ba39073711f628937a
• https://store.nethunter.com/repo?fingerprint=7e418d34c3ad4f3c37d7e6b0face13332364459c862134eb099a3bda2ccf4494
• https://cdn.kde.org/android/fdroid/repo?fingerprint=b3ebe10afa6c5c400379b34473e843d686c61ae6ad33f423c98af903f056523f
• https://cdn.kde.org/android/stable-releases/fdroid/repo/?fingerprint=13784ba6c80ff4e2181e55c56f961eed5844cea16870d3b38d58780b85e1158f
• https://fdroid.libretro.com/repo?fingerprint=3f05b24d497515f31feab421297c79b19552c5c81186b3750b7c131ef41d733d
• https://fdroid.libretro.com/archive?fingerprint=3f05b24d497515f31feab421297c79b19552c5c81186b3750b7c131ef41d733d
• https://molly.im/fdroid/foss/fdroid/repo?fingerprint=5198daef37fc23c14d5ee32305b2af45787bd7df2034de33ad302bdb3446df74
• https://f-droid.monerujo.io/fdroid/repo?fingerprint=a82c68e14af0aa6a2ec20e6b272eff25e5a038f3f65884316e0f5e0d91e7b713
• https://www.nanolx.org/fdroid/repo?fingerprint=862ed9f13a3981432bf86fe93d14596b381d75be83a1d616e2d44a12654ad015
• https://repo.netsyms.com/fdroid/repo?fingerprint=2581ba7b32d3ab443180c4087cab6a7e8fb258d3a6e98870ecb3c675e4d64489
• https://archive.newpipe.net/fdroid/repo?fingerprint=e2402c78f9b97c6c89e97db914a2751fda1d02fe2039cc0897a462bdb57e7501
• https://gitlab.com/TheCapsLock/fdroid-patched-apps/raw/master/fdroid/repo?fingerprint=313d9e6e789ff4e8e2d687aae31eef576050003ed67963301821ac6d3763e3ac
• https://fdroid.typeblog.net?fingerprint=1a7e446c491c80bc2f83844a26387887990f97f2f379ae7b109679feae3dbc8c
• https://fdroid.revolt.chat/repo/?fingerprint=0a9d2f61c8659801711e22177862f84c8134966f427973037a8fdfacff07c4f2
• https://fdroid.krombel.de/element-dev-fdroid/fdroid/repo?fingerprint=fd146ef30fa9f8f075bdcd9f02f069d22061b1df7cc90e90821750a7184bf53d
• https://fdroid.krombel.de/element-dev-gplay/fdroid/repo?fingerprint=5564ab4d4bf9461af7955449246f12d7e792a8d65165ebb2c0e90e65e77d5095
• https://fdroid.a3.pm/seabear/repo?fingerprint=9dc9cb5fdd85d37121a5fee99d24475f03fea7f2ec25fb94dd51866d87933ed1
• https://fdroid.getsession.org/fdroid/repo?fingerprint=db0e5297eb65cc22d6bd93c869943bdcfcb6a07dc69a48a0dd8c7ba698ec04e6
• https://app.simplex.chat/fdroid/repo?fingerprint=9f358ff284d1f71656a2bfaf0e005deae6aa14143720e089f11ff2ddcfeb01ba
• https://fdroid.stackwallet.com/fdroid/repo?fingerprint=764b4262f75750a5f620a205cee2886f18635fbda18df40758f5a1a45a950f84
• https://fdroid-repo.calyxinstitute.org/fdroid/repo?fingerprint=5da90117c91b0011ae44314ccc456cdfe406fbce3bf880072fd7c0b073e20df3
• https://calyxos.gitlab.io/calyx-fdroid-repo/fdroid/repo?fingerprint=c44d58b4547de5096138cb0b34a1cc99dab3b4274412ed753fccbfc11dc1b7b6
• https://releases.threema.ch/fdroid/repo?fingerprint=5734e753899b25775d90fe85362a49866e05ac4f83c05bef5a92880d2910639e
• https://fdroid.twinhelix.com/fdroid/repo?fingerprint=7b03b0232209b21b10a30a63897d3c6bca4f58fe29bc3477e8e3d8cf8e304028
• https://fdroid.secfirst.org/fdroid/repo?fingerprint=39eb57052f8d684514176819d1645f6a0a7bd943dbc31ab101949006ac0bc228
• https://www.droidware.info/fdroid/repo?fingerprint=2144449ab1dd270ec31b6087409b5d0ea39a75a9f290da62ac1b238a0eaaf851
• https://rfc2822.gitlab.io/fdroid-firefox/fdroid/?fingerprint=8f992bbba0340efe6299c7a410b36d9c8889114ca6c58013c3587cda411b4aed
• https://guardianproject-wind.s3.amazonaws.com/fdroid/repo?fingerprint=182cf464d219d340da443c62155198e399fec1bc4379309b775dd9fc97ed97e1
• https://repo.samourai.io/fdroid/repo/?fingerprint=5318afa280284855cf5d0027aa54517769f461d735980b1fb0854ceae8e072a5
• https://fdroid.cakelabs.com/?fingerprint=ea44efaee0b641ee7a032d397d5d976f9c4e5e1ed26e11c75702d064e55f8755

I usually keep the Archive variants disabled,
but they're nice to keep around,
for if you ever need an old version of an app.

Also,
most of these I've found through Droid-Ify,
it's my favorite app to manage my F-Droid apps: https://f-droid.org/packages/com.looker.droidify/