If you are have trouble with Trinity there are a lot of people on the forum willing to give you help.
But don't be an idiot! If you want help give the OS you are using, any patches you have added, the exact problem, etc.
Pick a decent topic title (you don't pay if you make descriptive topics). If you go to post a long log please use http://pastebin.com to post your log.
If you expect people to help you have enough respect to give these people the info to help you not just a vague question.
Since this is a huge thread i suggest you to use search feature of your browser and start writing only some words of your problem, for example, if you get:
Used MySQL library version (5.5.38) does not match the version used to compile TrinityCore (5.6.28)
try to write only Used MySQL library version or does not match the version used to compile TrinityCore, if you can't find try to reduce even more the amount of keywords.
FAQs
Database install errors: https://community.trinitycore.org/topic/1518-trouble-with-your-trinity-install-readme-1st-faqs/#comment-42704
Database update errors: https://community.trinitycore.org/topic/1518-trouble-with-your-trinity-install-readme-1st-faqs/#comment-47071
Other Database issues: https://community.trinitycore.org/topic/1518-trouble-with-your-trinity-install-readme-1st-faqs/#comment-47679
Startup errors: https://community.trinitycore.org/topic/1518-trouble-with-your-trinity-install-readme-1st-faqs/#comment-47668
Core compilation errors: https://community.trinitycore.org/topic/1518-trouble-with-your-trinity-install-readme-1st-faqs/#comment-47670
Core compilation errors Part 2: https://community.trinitycore.org/topic/1518-trouble-with-your-trinity-install-readme-1st-faqs/#comment-47706
Cmake errors: https://community.trinitycore.org/topic/1518-trouble-with-your-trinity-install-starting-login-readme-1st-faqs/#comment=47700
How to enable debug logs: https://community.trinitycore.org/topic/1518-trouble-with-your-trinity-install-readme-1st-faqs/#comment-47672
Features FAQ: https://community.trinitycore.org/topic/1518-trouble-with-your-trinity-install-readme-1st-faqs/#comment-47674
Extractor Issues: https://community.trinitycore.org/topic/1518-trouble-with-your-trinity-install-readme-1st-faqs/#comment-47677
Help TrinityCore Project: https://community.trinitycore.org/topic/1518-trouble-with-your-trinity-install-readme-1st-faqs/#comment-47682
Client Issues: https://community.trinitycore.org/topic/1518-trouble-with-your-trinity-install-readme-1st-faqs/#comment-47704
Permission issues: https://community.trinitycore.org/topic/1518-trouble-with-your-trinity-install-readme-1st-faqs/#comment-51603
Custom things: https://community.trinitycore.org/topic/1518-trouble-with-your-trinity-install-readme-1st-faqs/#comment-54355
Reporting a Bug: https://community.trinitycore.org/topic/1518-trouble-with-your-trinity-install-readme-1st-faqs/#comment-54419
Reporting a Bug Part 2: https://community.trinitycore.org/topic/1518-trouble-with-your-trinity-install-readme-1st-faqs/#comment-58063
Working with RBAC commands: https://community.trinitycore.org/topic/1518-trouble-with-your-trinity-install-readme-1st-faqs/#comment-59964
Working with RBAC commands Part 2: https://community.trinitycore.org/topic/1518-trouble-with-your-trinity-install-readme-1st-faqs/#comment-60047
Working with RBAC commands Part 3: https://community.trinitycore.org/topic/1518-trouble-with-your-trinity-install-readme-1st-faqs/#comment-60049
Manual Database Installation: https://community.trinitycore.org/topic/12451-updating-or-starting-with-trinitycore-issues/#comment-70079
Core Requierements: https://community.trinitycore.org/topic/12451-updating-or-starting-with-trinitycore-issues/#comment-70081
Login Into TrinityCore: https://community.trinitycore.org/topic/12451-updating-or-starting-with-trinitycore-issues/#comment-70086
VERY IMPORTANT: on branch master check BattleNet.log on your client directory to find better the reason of your issues to connect.
VERY IMPORTANT2 : We recommend don't use spaces on paths tools / deps can give strange errors if you use directories with spaces.