https://www.curseforge.com/wow/addons/litemount
By far the best and most used out of the 60 addons I run. Litemount is very powerful but it hugely increases the immersion factor in wow.
To get you started, this is my custom ruleset and groups. But be warned, I have over 600 mounts that make it work so you may need to modifiy it if you don’t have as many as I do. You can import my profile using the string below:
vYv3sYvns63L9gUyyI4O)L4oFadMGXgc31aXYgtHl7UO7AP6Q8wD1dJNl8Z(MPY8l1PBkVblqqRqNuPsLk)vkvT2TE16RU74dho)dN2D80UZ72Ep11RC5WKps)L(pFmNAstU3uVzOfCfPZPsYLvqNQEFVPVfDnbaFWhBdqLodL4uqan7IjNazTnvd63NCPbKrBsRcMczIyKbLZtjP3Glx05VdqC0RaRRMREb2CownKkKxih8kntl64Kcyl0syHKMmAshEU2YkXxtvD0Lywwr1AiORTWunghq2Wk2nPaKcUjfvr6FhDwhnLrvJfWXAtUGF0mGXxlcnhdnFz8DLJeDvVGGOY6I6wmTgDwlDsC5wl51r6dbfZ(sr32P9pDM5vU3w5cGjx0j9fZ6KvM0)Qy17d6wqQ59QWsnnHzL6nidPfc(8OtNrkfBLxDJV7h9kntTstLWOT7j9ZHmwQHu0H9ZwomyfQyLV1urW(O82QwqAoxJYWZtoNUDNJqaLwMtQUaTMJY0Nj9lWi9tfLr2MYTjdNQstUmPRiAxxfgIvOtwczL3rYAtfDklPAaZUx31ZXgyy0Nv6Wxi2O2mKuS3)UZwLQjHPstNisrOPQKrImhRDyriMsJLPrhehrAg9q)Hut9QqBVzEaGqQjDfLkYCNQkX2QeJr6I2DLwzirKnRxXimzXmcpwOoflPuw1Z5fQ0ktYi6sImcOlPwyAQyRZXsYnewvIN3Jx0zblUQUlswUulg9VlOQvs5jB2h7s5SngDoNMCkdR)9XMSicvRTgeWtWcOV0IP4OPHuak3zzmkvYk2mdVENYfRfi5WRtf9TPIRA40jJHuAc(XWvjRuiVyHUOtNrj6AMmMhll6TmG1p6f6QfpyQKn88OtLSCl2Cv6Vvbr7AKHDDZJmYQB(m6lrBPQkbTjOerlWemvrIjWmFKiADztsObBsLvcjVKGPYI2hPo5sklNmwdD9ukcpqoZXsziAzEfz7(WvOh(i4vCXMCVnrkVRdPqCPwZugPoHycPaQA7KpxvIK5dqzLCmPnNsKC8au4135RM6wz4voaXhEYAgfk0sSfSLcbzWGuza9MJvacgG4loDzhlW1l35GvpwHQGajMPbf0HuOpYV(Gtc(Ndszm1PRow2aJM3Pm2JmpKSfCati3pbiNuPKueC)(3DGLLwS7NguhSB5Ifv7I8xgkJ1K2KxOTrNLbOWe4uud8iqkekz7ITkchHwcauwUsA2sHQmbK3pvJILLqmq83hRwnaGEtZdhK)jtgEBUAq)GI7ldMerTvvv1JWTiRJd)7bvwQdz2i76475X3v52HcChGf9QtvkAE9DrDfeg7N9MYOiDvvWppnPM0DK55jd9LHkAXcndwkiePnjMciKASborASVMg7B(IRm6SAeYG6slgKkTwGLkUtL)XCQXc1mMqMNHxWMzQl6BQBshzPutmG8j0qi4Km(0yuPbOjJalJovr0gCGZdpo(8ciri4ymKEh0aO)bMN9M5BEmnBkHGGh2kPnC4hKh(yIqKGumfQpjhhoKBaRobKp12yUudmokIav(JmB0gq2gqAscqTJXkIamuhYKrijXJcHQ2AJDvkDObcCAVuuXHXWuKLjZmJ9cvw2rUO0T4oYwWewmfi9eSfW84fRg43lNwoEtXl6GGHZsEQr57PaePilIdmSO30OjcGKCUHOLC6EF)7Qanz7knimWpyau02IEercLauE05Irb0wnNIea(jBAhSw1reVJRE6kj)cEa2hPeH14Ej6tftymbdwWtqFmkhIZzwXuDcU8jkPag7uc8Ia5rmnKtuBt9MkgOOEXAj3YWqyQwxODghsYwg6wMHSLSXmGeFz)si6QP00GXObBWegSkNZASmKUKBe0z22WZUHgSoR83vh4uqdze3azuzQyJcjKWOvv7MCiyckyfWUCqkJuurO)Cg3ijPcSvYKAEGZkA6Rd6dmZk(E2zrlnr(JbRivM0Ok9i)ZoMk2Kcd8eRsXpR7ONiGJKS1yHCwQW(fHV2WruqXiGKfPK9Id)pk6jZRWtejSmyzz3aPTbaEGkpSVWJYpaq7LeaGcxZfCXbarq2TfDMSrTWWABbHn4WHrNLX6AbUQ2cZn6ej35GeiLF0cQkpMke5iNxWcgNqHCWelgLffBehxqHI3Xwb4SLilPAExusDPYa)Mczwf8Yu685X3RdmP65zkktWbO4EqeDPMDOseUAdakJM1bg05DYhuBcmfc38(eY9I42Md3mu9ifRWIE1ytigBaeRxnMtkb16as97Kj3jJOGfNWuZshJpGnqu2jnqbbfgZFzmkeWh2I7JxnOqs56MvCC6KmPSy9B6oU8GTv8JPnng2GzI9a2eSBaqDaWWMMUg4vZcqxmz6QjzhHidGgRblga)7uM8i8sAykxKm5uZJVRKyjJqX8UasXIIAghDth2bjyhNknm4LlxmlGKnKXwgyPmS6Wyqb5YEWhWcp1ttQcGJ4yWEsSwapNhMcR3V47w8IoSP65SdHOmPSc7nevIeQTJFMSxBcLMvEFjGJhJh0coUW7AfOmxcbScPTUWaWkMOYiePPLucKpraHKvnxzXKQgdsaveXPXBtubCxqo0XXTMnNumLaz6ccEO)DL9qB3yZIbqWAQMDwokn7yUBtwgZPjKrBcN3rF8lgLUOQKT)M1uft5rjtLlsZv1w)kKC4O6snyrtYyf((IEKFSJSkOuaPGgRw4IiwhEgqCrmSofzTKcBHjmHSMW9tqk6iJK(G0P1rAYfBfegFx3mljy3keD44Ny8RRWeTVjZpfCqdID2H7WcBQEijSI4yOnBy4EKthNsIZpWAyaaITMSfG1AmIq8O5cSicw1ctkzxRbXJJ2MG5gIgvE0P(Dskb2yNsJOnRdAfhHb3BX61C4rP3H9qshtXfN(RLNq0I(NIOxzCbVLRFjoo5ANdKqXsRH8tJJiyACc98PhRDAgMziRJVVy8TrVyjuQytIYWfztgTdoIgLLXabkYSmGyzyCHZOmVSp4fHIEybQGNbkDn)aw14fLPem0rtAopaipq2IPaAsTSDbpuOPiwal3DhzOt4mKfZj4jmIO1MC485jJhilztiGfDHjxY1isNL2IGAyJphpPziI4njrGcIXRmHin69IO5c4aDiz)KTFrPXQlGyn0qWXu3JySG7vkXo1cofwaCwqH0hmlmriDsRwPvfUz7HyPbgssPWa7KD3wnYhPYvlt482572bc0CtLBvBwyY(ieOdJt8oUuYBAbLoKsHN1mFTMYII0tvALMO4WSj81rz8ybRrPIUGyfaAuKPoBDPZkZvXMrf3TqL4PWQBaNUdLhtdQPLK5okfWXNYr7PhQeFwIkvXMCaOn7uR5L1i8fGlskkaz)aU0cMBajoo6dDY4yBhtM(Dko)r8rWFpVeqsBtiPYifWO5Vg3YdZIHPuSQy1ul09gUPbkSwhcmf3SLJuSgxkX0KLEioxGsfXnqAafqrovfHt(tNs2Egm)30LbFPZkbZAnQGofkRLBN51Lid4k1Uqho1rD3NI(fP2MSRrHK9IQv6CyXbkMTBNVHGx5qLTya9Wcc5svfejRp2D3qiDHGmcWiJ4ROuzWoghla2g50CX(WKh85CAAGv1UiJvbv4qERfCjsbYDQ2mYjbRZ404w5SRVJXO5lr1DzePA5KVQMfrAdjQTW2RhxT)eURkk6ClmlomvPZucAaoA1AULPTgD8uwsiErhYYHIhYBhlDyACWLrC2urCDdDkDOmLn3lvZX94emiwV3KYG9I4KZ8en8BhW5oY7hQF)YinrQTDy6ousd8HGnnwlQaBfSFUKgMSGpXntWwRGHlAttNuVFzYqlMP6GsldSkWwSBRNt9fbFZKADakSl4SeRIq3Ipb3X9XRBLrC3ZCmhJysWjXe8tg5fcdPzS91OOMw0BAWEqKPElJyYQJDcxEu3dSyfQxfo4AKtG32kP5fYvEuBkC6M(bw1vkXHvwvDCBMCg76UcFhSXb(LEPGGvMcNrMYjBrCywDKIqPitcHX4TmvqEEmOiAvCJ9fYCkS9Gm3idB2LVttLAWIvPr0YnC1yKPj47MitVf3AOo2(1Wq4IpWnIB1U34gUydILa5psSRyZfccHtCFibmk4hemDWJOiiRunZjFd76mpb66TcMF)eYdJ8AGJrMscyYcmV5T0prKM8r7I0)yCHLfUqs20j0KTtSPKsWTiFjWWfhmzsUpJOKJy1Bbte3xJxPxCrktHm1aZR06ddQct7C9MycIkXr4gUIDHLNFkUhb(qdrVu(qw4AkpLIdaNmuSyh6PDJemBWoEdpkXdwrc3LvLfBesHXLGa(qKGMEr)CZJlyNzii7LwcDMWIJq4IRxez309gRmFkNM4ynbFGC84krXcsAt(advB2e2S45Tk9Oeq2pSnrvMpb358Ho7bbqHsjiLJau9wpHZWJRucSLgW9usIb1feQQ8WEucJ5eMjO8(RJEv7me3xZ)KZ7wNk2IIfHoIaIXk0ETSb4tl0I7h3LCVuquhL2b71bDbT20fqd3ek7CWnaTzJFq046jdy)nxqowuoA4gyyXuiOvGsi7JeNsmzpXU1KakGl(GhDdqf2dTpIdKUMGZDEFEAqtWHBXsYmHYpOxHwfqkoRULWf4tX7M1jT)9Hll4qmJSqDb7aX5nDKmeVS7nJrejFyu8nXMD8N1GvCou4akplzvHuyCwywGxuaiWWgxra6GsfnLhwEjzRDZyZKfyec2QNpbIUDupr89zlyKm)bz0jlppAtcsg8KRQlP24E6QieUAoyhjiQ2rkDf4INVJzD6BO(ScKTimtua7yIMmJDCYk6AQWvoiiFuTH9YjuLCItOmydLiun5Bodk51KvFMCtN1erEYxAPsdvkiJMH30qJheE2oVeUPUPs2jmF08zob0ItkJjmCAJbC5xNxF1Ph2RLfS8)U6LCfd)X38FD)dV9UTNUz71)Jp(MR(PV9L04gFC3H7pV5W72(f(KFIay(0M39BBpC7UR3(X38IJ73F83PPC9vxD3MtNVWGCzAqRULa(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